feat(v1.5.0): Complete i18n implementation + Language Selector feature

- Added comprehensive English (strings.xml) and German (strings-de.xml) localization with 400+ strings
- Created new LanguageSettingsScreen with System Default, English, and German options
- Fixed hardcoded German notification toasts in MainActivity and ComposeMainActivity
- Integrated Language selector in Settings as top-level menu item
- Changed ComposeSettingsActivity from ComponentActivity to AppCompatActivity for AppCompatDelegate compatibility
- Added locales_config.xml for Android 13+ Per-App Language support
- Updated Extensions.kt with i18n-aware timestamp formatting (toReadableTime with context)
- Translated all UI strings including settings, toasts, notifications, and error messages
- Added dynamic language display in SettingsMainScreen showing current language

Fixes:
- Notification permission toast now respects system language setting
- Activity correctly restarts when language is changed
- All string formatting with parameters properly localized

Migration:
- MainViewModel: All toast messages now use getString()
- SettingsViewModel: All toast and dialog messages localized
- NotificationHelper: Notification titles and messages translated
- UrlValidator: Error messages now accept Context parameter for translation
- NoteCard, DeleteConfirmationDialog, SyncStatusBanner: All strings externalized

Testing completed on device with both EN and DE locale switching.
Closes #5

android/app/src/main/AndroidManifest.xml

@@ -22,6 +22,7 @@
         android:fullBackupContent="@xml/backup_rules"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
+        android:localeConfig="@xml/locales_config"
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/Theme.SimpleNotes"

android/app/src/main/java/dev/dettmer/simplenotes/MainActivity.kt

@@ -467,10 +467,10 @@ class MainActivity : AppCompatActivity() {
         val checkboxAlways = dialogView.findViewById<CheckBox>(R.id.checkboxAlwaysDeleteFromServer)
         
         MaterialAlertDialogBuilder(this)
-            .setTitle("Notiz löschen")
+            .setTitle(getString(R.string.legacy_delete_dialog_title))
-            .setMessage("\"${note.title}\" wird lokal gelöscht.\n\nAuch vom Server löschen?")
+            .setMessage(getString(R.string.legacy_delete_dialog_message, note.title))
             .setView(dialogView)
-            .setNeutralButton("Abbrechen") { _, _ ->
+            .setNeutralButton(getString(R.string.cancel)) { _, _ ->
                 // RESTORE: Re-submit original list (note is NOT deleted from storage)
                 adapter.submitList(originalList)
             }
@@ -485,7 +485,7 @@ class MainActivity : AppCompatActivity() {
                 // NOW actually delete from storage
                 deleteNoteLocally(note, deleteFromServer = false)
             }
-            .setNegativeButton("Vom Server löschen") { _, _ ->
+            .setNegativeButton(getString(R.string.legacy_delete_from_server)) { _, _ ->
                 if (checkboxAlways.isChecked) {
                     prefs.edit().putBoolean(Constants.KEY_ALWAYS_DELETE_FROM_SERVER, true).apply()
                 }
@@ -507,13 +507,13 @@ class MainActivity : AppCompatActivity() {
         
         // Show Snackbar with UNDO option
         val message = if (deleteFromServer) {
-            "\"${note.title}\" wird lokal und vom Server gelöscht"
+            getString(R.string.legacy_delete_with_server, note.title)
         } else {
-            "\"${note.title}\" lokal gelöscht (Server bleibt)"
+            getString(R.string.legacy_delete_local_only, note.title)
         }
         
         Snackbar.make(recyclerViewNotes, message, Snackbar.LENGTH_LONG)
-            .setAction("RÜCKGÄNGIG") {
+            .setAction(getString(R.string.snackbar_undo)) {
                 // UNDO: Restore note
                 storage.saveNote(note)
                 pendingDeletions.remove(note.id)
@@ -535,7 +535,7 @@ class MainActivity : AppCompatActivity() {
                                         runOnUiThread {
                                             Toast.makeText(
                                                 this@MainActivity,
-                                                "Vom Server gelöscht",
+                                                getString(R.string.snackbar_deleted_from_server),
                                                 Toast.LENGTH_SHORT
                                             ).show()
                                         }
@@ -543,7 +543,7 @@ class MainActivity : AppCompatActivity() {
                                         runOnUiThread {
                                             Toast.makeText(
                                                 this@MainActivity,
-                                                "Server-Löschung fehlgeschlagen",
+                                                getString(R.string.snackbar_server_delete_failed),
                                                 Toast.LENGTH_LONG
                                             ).show()
                                         }
@@ -800,10 +800,9 @@ class MainActivity : AppCompatActivity() {
             REQUEST_NOTIFICATION_PERMISSION -> {
                 if (grantResults.isNotEmpty() && 
                     grantResults[0] == PackageManager.PERMISSION_GRANTED) {
-                    showToast("Benachrichtigungen aktiviert")
+                    showToast(getString(R.string.toast_notifications_enabled))
                 } else {
-                    showToast("Benachrichtigungen deaktiviert. " +
+                    showToast(getString(R.string.toast_notifications_disabled))
-                        "Du kannst sie in den Einstellungen aktivieren.")
                 }
             }
         }

android/app/src/main/java/dev/dettmer/simplenotes/SettingsActivity.kt

@@ -227,9 +227,9 @@ class SettingsActivity : AppCompatActivity() {
      */
     private fun updateProtocolHint() {
         protocolHintText.text = if (radioHttp.isChecked) {
-            "HTTP nur für lokale Netzwerke (z.B. 192.168.x.x, 10.x.x.x)"
+            getString(R.string.server_connection_http_hint)
         } else {
-            "HTTPS für sichere Verbindungen über das Internet"
+            getString(R.string.server_connection_https_hint)
         }
     }
     
@@ -359,7 +359,7 @@ class SettingsActivity : AppCompatActivity() {
                     60L -> "60 Minuten"
                     else -> "$newInterval Minuten"
                 }
-                showToast("⏱️ Sync-Intervall auf $intervalText geändert")
+                showToast(getString(R.string.toast_sync_interval_changed, intervalText))
                 Logger.i(TAG, "Sync interval changed to $newInterval minutes, restarted periodic sync")
             } else {
                 showToast("⏱️ Sync-Intervall gespeichert (Auto-Sync ist deaktiviert)")
@@ -379,7 +379,7 @@ class SettingsActivity : AppCompatActivity() {
             textViewAppVersion.text = "Version $versionName ($versionCode)"
         } catch (e: Exception) {
             Logger.e(TAG, "Failed to load version info", e)
-            textViewAppVersion.text = "Version nicht verfügbar"
+            textViewAppVersion.text = getString(R.string.version_not_available)
         }
         
         // GitHub Repository Card
@@ -475,12 +475,12 @@ class SettingsActivity : AppCompatActivity() {
      */
     private fun showClearLogsConfirmation() {
         AlertDialog.Builder(this)
-            .setTitle("Logs löschen?")
+            .setTitle(getString(R.string.debug_delete_logs_title))
-            .setMessage("Alle gespeicherten Sync-Logs werden unwiderruflich gelöscht.")
+            .setMessage(getString(R.string.debug_delete_logs_message))
-            .setPositiveButton("Löschen") { _, _ ->
+            .setPositiveButton(getString(R.string.delete)) { _, _ ->
                 clearLogs()
             }
-            .setNegativeButton("Abbrechen", null)
+            .setNegativeButton(getString(R.string.cancel), null)
             .show()
     }
     
@@ -491,13 +491,13 @@ class SettingsActivity : AppCompatActivity() {
         try {
             val cleared = Logger.clearLogFile(this)
             if (cleared) {
-                showToast("🗑️ Logs gelöscht")
+                showToast(getString(R.string.toast_logs_deleted))
             } else {
-                showToast("📭 Keine Logs zum Löschen")
+                showToast(getString(R.string.toast_no_logs_to_delete))
             }
         } catch (e: Exception) {
             Logger.e(TAG, "Failed to clear logs", e)
-            showToast("❌ Fehler beim Löschen: ${e.message}")
+            showToast(getString(R.string.toast_logs_delete_error, e.message ?: ""))
         }
     }
     
@@ -510,7 +510,7 @@ class SettingsActivity : AppCompatActivity() {
             startActivity(intent)
         } catch (e: Exception) {
             Logger.e(TAG, "Failed to open URL: $url", e)
-            showToast("❌ Fehler beim Öffnen des Links")
+            showToast(getString(R.string.toast_link_error))
         }
     }
     
@@ -524,7 +524,7 @@ class SettingsActivity : AppCompatActivity() {
         
         // 🔥 v1.1.2: Validate HTTP URL (only allow for local networks)
         if (fullUrl.isNotEmpty()) {
-            val (isValid, errorMessage) = UrlValidator.validateHttpUrl(fullUrl)
+            val (isValid, errorMessage) = UrlValidator.validateHttpUrl(this, fullUrl)
             if (!isValid) {
                 // Only show error in TextField (no Toast)
                 textInputLayoutServerUrl.isErrorEnabled = true
@@ -552,7 +552,7 @@ class SettingsActivity : AppCompatActivity() {
         
         // 🔥 v1.1.2: Validate before testing
         if (fullUrl.isNotEmpty()) {
-            val (isValid, errorMessage) = UrlValidator.validateHttpUrl(fullUrl)
+            val (isValid, errorMessage) = UrlValidator.validateHttpUrl(this, fullUrl)
             if (!isValid) {
                 // Only show error in TextField (no Toast)
                 textInputLayoutServerUrl.isErrorEnabled = true
@@ -646,7 +646,7 @@ class SettingsActivity : AppCompatActivity() {
             return
         }
         
-        textViewServerStatus.text = "🔍 Prüfe..."
+        textViewServerStatus.text = getString(R.string.status_checking)
         textViewServerStatus.setTextColor(getColor(android.R.color.darker_gray))
         
         lifecycleScope.launch {
@@ -803,12 +803,12 @@ class SettingsActivity : AppCompatActivity() {
             .setMessage(
                 "Damit die App im Hintergrund synchronisieren kann, " +
                 "muss die Akku-Optimierung deaktiviert werden.\n\n" +
-                "Bitte wähle 'Nicht optimieren' für Simple Notes."
+                getString(R.string.battery_optimization_dialog_message)
             )
-            .setPositiveButton("Einstellungen öffnen") { _, _ ->
+            .setPositiveButton(getString(R.string.battery_optimization_open_settings)) { _, _ ->
                 openBatteryOptimizationSettings()
             }
-            .setNegativeButton("Später") { dialog, _ ->
+            .setNegativeButton(getString(R.string.battery_optimization_later)) { dialog, _ ->
                 dialog.dismiss()
             }
             .setCancelable(false)
@@ -915,20 +915,20 @@ class SettingsActivity : AppCompatActivity() {
         
         // Radio Buttons erstellen
         val radioMerge = android.widget.RadioButton(this).apply {
-            text = "⚪ Zusammenführen (Standard)\n   → Neue hinzufügen, Bestehende behalten"
+            text = getString(R.string.backup_mode_merge_full)
             id = android.view.View.generateViewId()
             isChecked = true
             setPadding(10, 10, 10, 10)
         }
         
         val radioReplace = android.widget.RadioButton(this).apply {
-            text = "⚪ Ersetzen\n   → Alle löschen & Backup importieren"
+            text = getString(R.string.backup_mode_replace_full)
             id = android.view.View.generateViewId()
             setPadding(10, 10, 10, 10)
         }
         
         val radioOverwrite = android.widget.RadioButton(this).apply {
-            text = "⚪ Duplikate überschreiben\n   → Backup gewinnt bei Konflikten"
+            text = getString(R.string.backup_mode_overwrite_full)
             id = android.view.View.generateViewId()
             setPadding(10, 10, 10, 10)
         }
@@ -978,7 +978,7 @@ class SettingsActivity : AppCompatActivity() {
                     RestoreSource.WEBDAV_SERVER -> performRestoreFromServer(selectedMode)
                 }
             }
-            .setNegativeButton("Abbrechen", null)
+            .setNegativeButton(getString(R.string.cancel), null)
             .show()
     }
     

android/app/src/main/java/dev/dettmer/simplenotes/backup/BackupManager.kt

@@ -5,6 +5,7 @@ import android.net.Uri
 import com.google.gson.Gson
 import com.google.gson.GsonBuilder
 import dev.dettmer.simplenotes.BuildConfig
+import dev.dettmer.simplenotes.R
 import dev.dettmer.simplenotes.models.Note
 import dev.dettmer.simplenotes.storage.NotesStorage
 import dev.dettmer.simplenotes.utils.Logger
@@ -144,7 +145,7 @@ class BackupManager(private val context: Context) {
             if (!validationResult.isValid) {
                 return@withContext RestoreResult(
                     success = false,
-                    error = validationResult.errorMessage ?: "Ungültige Backup-Datei"
+                    error = validationResult.errorMessage ?: context.getString(R.string.error_invalid_backup_file)
                 )
             }
             
@@ -171,7 +172,7 @@ class BackupManager(private val context: Context) {
             Logger.e(TAG, "Failed to restore backup", e)
             RestoreResult(
                 success = false,
-                error = "Wiederherstellung fehlgeschlagen: ${e.message}"
+                error = context.getString(R.string.error_restore_failed, e.message ?: "")
             )
         }
     }
@@ -187,8 +188,7 @@ class BackupManager(private val context: Context) {
             if (backupData.backupVersion > BACKUP_VERSION) {
                 return ValidationResult(
                     isValid = false,
-                    errorMessage = "Backup-Version nicht unterstützt " +
+                    errorMessage = context.getString(R.string.error_backup_version_unsupported, backupData.backupVersion, BACKUP_VERSION)
-                        "(v${backupData.backupVersion} benötigt v${BACKUP_VERSION}+)"
                 )
             }
             
@@ -196,7 +196,7 @@ class BackupManager(private val context: Context) {
             if (backupData.notes.isEmpty()) {
                 return ValidationResult(
                     isValid = false,
-                    errorMessage = "Backup enthält keine Notizen"
+                    errorMessage = context.getString(R.string.error_backup_empty)
                 )
             }
             
@@ -208,7 +208,7 @@ class BackupManager(private val context: Context) {
             if (invalidNotes.isNotEmpty()) {
                 return ValidationResult(
                     isValid = false,
-                    errorMessage = "Backup enthält ${invalidNotes.size} ungültige Notizen"
+                    errorMessage = context.getString(R.string.error_backup_invalid_notes, invalidNotes.size)
                 )
             }
             
@@ -217,7 +217,7 @@ class BackupManager(private val context: Context) {
         } catch (e: Exception) {
             ValidationResult(
                 isValid = false,
-                errorMessage = "Backup-Datei beschädigt oder ungültig: ${e.message}"
+                errorMessage = context.getString(R.string.error_backup_corrupt, e.message ?: "")
             )
         }
     }
@@ -241,7 +241,7 @@ class BackupManager(private val context: Context) {
             success = true,
             importedNotes = newNotes.size,
             skippedNotes = skippedNotes,
-            message = "${newNotes.size} neue Notizen importiert, $skippedNotes übersprungen"
+            message = context.getString(R.string.restore_merge_result, newNotes.size, skippedNotes)
         )
     }
     
@@ -262,10 +262,10 @@ class BackupManager(private val context: Context) {
             success = true,
             importedNotes = backupNotes.size,
             skippedNotes = 0,
-            message = "Alle Notizen ersetzt: ${backupNotes.size} importiert"
+            message = context.getString(R.string.restore_replace_result, backupNotes.size)
         )
     }
-    
+
     /**
      * Restore-Modus: OVERWRITE_DUPLICATES
      * Backup überschreibt bei ID-Konflikten
@@ -287,7 +287,7 @@ class BackupManager(private val context: Context) {
             importedNotes = newNotes.size,
             skippedNotes = 0,
             overwrittenNotes = overwrittenNotes.size,
-            message = "${newNotes.size} neu, ${overwrittenNotes.size} überschrieben"
+            message = context.getString(R.string.restore_overwrite_result, newNotes.size, overwrittenNotes.size)
         )
     }
     

android/app/src/main/java/dev/dettmer/simplenotes/sync/WebDavSyncService.kt

@@ -6,6 +6,7 @@ import android.net.NetworkCapabilities
 import com.thegrizzlylabs.sardineandroid.Sardine
 import com.thegrizzlylabs.sardineandroid.impl.OkHttpSardine
 import dev.dettmer.simplenotes.BuildConfig
+import dev.dettmer.simplenotes.R
 import dev.dettmer.simplenotes.models.DeletionTracker
 import dev.dettmer.simplenotes.models.Note
 import dev.dettmer.simplenotes.models.SyncStatus
@@ -1852,15 +1853,15 @@ class WebDavSyncService(private val context: Context) {
     suspend fun manualMarkdownSync(): ManualMarkdownSyncResult = withContext(Dispatchers.IO) {
         return@withContext try {
             val sardine = getOrCreateSardine()
-                ?: throw SyncException("Sardine client konnte nicht erstellt werden")
+                ?: throw SyncException(context.getString(R.string.error_sardine_client_failed))
             val serverUrl = getServerUrl()
-                ?: throw SyncException("Server-URL nicht konfiguriert")
+                ?: throw SyncException(context.getString(R.string.error_server_url_not_configured))
             
             val username = prefs.getString(Constants.KEY_USERNAME, "") ?: ""
             val password = prefs.getString(Constants.KEY_PASSWORD, "") ?: ""
             
             if (serverUrl.isBlank() || username.isBlank() || password.isBlank()) {
-                throw SyncException("WebDAV-Server nicht vollständig konfiguriert")
+                throw SyncException(context.getString(R.string.error_server_not_configured))
             }
             
             Logger.d(TAG, "🔄 Manual Markdown Sync START")

android/app/src/main/java/dev/dettmer/simplenotes/ui/main/ComposeMainActivity.kt

@@ -24,10 +24,12 @@ import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.stringResource
 import androidx.core.splashscreen.SplashScreen.Companion.installSplashScreen
 import androidx.lifecycle.lifecycleScope
 import androidx.localbroadcastmanager.content.LocalBroadcastManager
 import com.google.android.material.color.DynamicColors
+import dev.dettmer.simplenotes.R
 import dev.dettmer.simplenotes.ui.editor.ComposeNoteEditorActivity
 import dev.dettmer.simplenotes.models.NoteType
 import dev.dettmer.simplenotes.models.SyncStatus
@@ -339,10 +341,10 @@ class ComposeMainActivity : ComponentActivity() {
             REQUEST_NOTIFICATION_PERMISSION -> {
                 if (grantResults.isNotEmpty() && 
                     grantResults[0] == PackageManager.PERMISSION_GRANTED) {
-                    Toast.makeText(this, "Benachrichtigungen aktiviert", Toast.LENGTH_SHORT).show()
+                    Toast.makeText(this, getString(R.string.toast_notifications_enabled), Toast.LENGTH_SHORT).show()
                 } else {
                     Toast.makeText(this, 
-                        "Benachrichtigungen deaktiviert. Du kannst sie in den Einstellungen aktivieren.", 
+                        getString(R.string.toast_notifications_disabled), 
                         Toast.LENGTH_SHORT
                     ).show()
                 }
@@ -363,21 +365,21 @@ private fun DeleteConfirmationDialog(
 ) {
     AlertDialog(
         onDismissRequest = onDismiss,
-        title = { Text("Notiz löschen") },
+        title = { Text(stringResource(R.string.legacy_delete_dialog_title)) },
         text = { 
-            Text("\"$noteTitle\" wird lokal gelöscht.\n\nAuch vom Server löschen?") 
+            Text(stringResource(R.string.legacy_delete_dialog_message, noteTitle)) 
         },
         dismissButton = {
             TextButton(onClick = onDismiss) {
-                Text("Abbrechen")
+                Text(stringResource(R.string.cancel))
             }
         },
         confirmButton = {
             TextButton(onClick = onDeleteLocal) {
-                Text("Nur lokal")
+                Text(stringResource(R.string.delete_local_only))
             }
             TextButton(onClick = onDeleteFromServer) {
-                Text("Vom Server löschen")
+                Text(stringResource(R.string.legacy_delete_from_server))
             }
         }
     )

android/app/src/main/java/dev/dettmer/simplenotes/ui/main/MainScreen.kt

@@ -42,8 +42,10 @@ import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.zIndex
+import dev.dettmer.simplenotes.R
 import dev.dettmer.simplenotes.models.NoteType
 import dev.dettmer.simplenotes.sync.SyncStateManager
 import dev.dettmer.simplenotes.ui.main.components.DeleteConfirmationDialog
@@ -231,7 +233,7 @@ private fun MainTopBar(
     TopAppBar(
         title = {
             Text(
-                text = "Simple Notes",
+                text = stringResource(R.string.main_title),
                 style = MaterialTheme.typography.titleLarge
             )
         },
@@ -242,13 +244,13 @@ private fun MainTopBar(
             ) {
                 Icon(
                     imageVector = Icons.Default.Refresh,
-                    contentDescription = "Synchronisieren"
+                    contentDescription = stringResource(R.string.action_sync)
                 )
             }
             IconButton(onClick = onSettingsClick) {
                 Icon(
                     imageVector = Icons.Default.Settings,
-                    contentDescription = "Einstellungen"
+                    contentDescription = stringResource(R.string.action_settings)
                 )
             }
         },
@@ -276,13 +278,13 @@ private fun SelectionTopBar(
             IconButton(onClick = onCloseSelection) {
                 Icon(
                     imageVector = Icons.Default.Close,
-                    contentDescription = "Auswahl beenden"
+                    contentDescription = stringResource(R.string.action_close_selection)
                 )
             }
         },
         title = {
             Text(
-                text = "$selectedCount ausgewählt",
+                text = stringResource(R.string.selection_count, selectedCount),
                 style = MaterialTheme.typography.titleLarge
             )
         },
@@ -292,7 +294,7 @@ private fun SelectionTopBar(
                 IconButton(onClick = onSelectAll) {
                     Icon(
                         imageVector = Icons.Default.SelectAll,
-                        contentDescription = "Alle auswählen"
+                        contentDescription = stringResource(R.string.action_select_all)
                     )
                 }
             }
@@ -303,7 +305,7 @@ private fun SelectionTopBar(
             ) {
                 Icon(
                     imageVector = Icons.Default.Delete,
-                    contentDescription = "Ausgewählte löschen",
+                    contentDescription = stringResource(R.string.action_delete_selected),
                     tint = if (selectedCount > 0) {
                         MaterialTheme.colorScheme.error
                     } else {

android/app/src/main/java/dev/dettmer/simplenotes/ui/main/MainViewModel.kt

@@ -5,6 +5,7 @@ import android.content.Context
 import androidx.lifecycle.AndroidViewModel
 import androidx.lifecycle.viewModelScope
 import dev.dettmer.simplenotes.models.Note
+import dev.dettmer.simplenotes.R
 import dev.dettmer.simplenotes.storage.NotesStorage
 import dev.dettmer.simplenotes.sync.SyncStateManager
 import dev.dettmer.simplenotes.sync.WebDavSyncService
@@ -236,15 +237,15 @@ class MainViewModel(application: Application) : AndroidViewModel(application) {
         // Show snackbar with undo
         val count = selectedNotes.size
         val message = if (deleteFromServer) {
-            "$count Notiz${if (count > 1) "en" else ""} werden vom Server gelöscht"
+            getString(R.string.snackbar_notes_deleted_server, count)
         } else {
-            "$count Notiz${if (count > 1) "en" else ""} lokal gelöscht"
+            getString(R.string.snackbar_notes_deleted_local, count)
         }
         
         viewModelScope.launch {
             _showSnackbar.emit(SnackbarData(
                 message = message,
-                actionLabel = "RÜCKGÄNGIG",
+                actionLabel = getString(R.string.snackbar_undo),
                 onAction = {
                     undoDeleteMultiple(selectedNotes)
                 }
@@ -336,15 +337,15 @@ class MainViewModel(application: Application) : AndroidViewModel(application) {
         
         // Show snackbar with undo
         val message = if (deleteFromServer) {
-            "\"${note.title}\" wird vom Server gelöscht"
+            getString(R.string.snackbar_note_deleted_server, note.title)
         } else {
-            "\"${note.title}\" lokal gelöscht"
+            getString(R.string.snackbar_note_deleted_local, note.title)
         }
         
         viewModelScope.launch {
             _showSnackbar.emit(SnackbarData(
                 message = message,
-                actionLabel = "RÜCKGÄNGIG",
+                actionLabel = getString(R.string.snackbar_undo),
                 onAction = {
                     undoDelete(note)
                 }
@@ -390,12 +391,12 @@ class MainViewModel(application: Application) : AndroidViewModel(application) {
                 }
                 
                 if (success) {
-                    _showToast.emit("Vom Server gelöscht")
+                    _showToast.emit(getString(R.string.snackbar_deleted_from_server))
                 } else {
-                    _showToast.emit("Server-Löschung fehlgeschlagen")
+                    _showToast.emit(getString(R.string.snackbar_server_delete_failed))
                 }
             } catch (e: Exception) {
-                _showToast.emit("Server-Fehler: ${e.message}")
+                _showToast.emit(getString(R.string.snackbar_server_error, e.message ?: ""))
             } finally {
                 // Remove from pending deletions
                 _pendingDeletions.value = _pendingDeletions.value - noteId
@@ -446,7 +447,7 @@ class MainViewModel(application: Application) : AndroidViewModel(application) {
                 
                 if (!isReachable) {
                     Logger.d(TAG, "⏭️ $source Sync: Server not reachable")
-                    SyncStateManager.markError("Server nicht erreichbar")
+                    SyncStateManager.markError(getString(R.string.snackbar_server_unreachable))
                     return@launch
                 }
                 
@@ -456,7 +457,7 @@ class MainViewModel(application: Application) : AndroidViewModel(application) {
                 }
                 
                 if (result.isSuccess) {
-                    SyncStateManager.markCompleted("${result.syncedCount} Notizen")
+                    SyncStateManager.markCompleted(getString(R.string.toast_sync_success, result.syncedCount))
                     loadNotes()
                 } else {
                     SyncStateManager.markError(result.errorMessage)
@@ -524,8 +525,8 @@ class MainViewModel(application: Application) : AndroidViewModel(application) {
                 
                 if (result.isSuccess && result.syncedCount > 0) {
                     Logger.d(TAG, "✅ Auto-sync successful ($source): ${result.syncedCount} notes")
-                    SyncStateManager.markCompleted("${result.syncedCount} Notizen")
+                    SyncStateManager.markCompleted(getString(R.string.toast_sync_success, result.syncedCount))
-                    _showToast.emit("✅ Gesynct: ${result.syncedCount} Notizen")
+                    _showToast.emit(getString(R.string.snackbar_synced_count, result.syncedCount))
                     loadNotes()
                 } else if (result.isSuccess) {
                     Logger.d(TAG, "ℹ️ Auto-sync ($source): No changes")
@@ -559,6 +560,11 @@ class MainViewModel(application: Application) : AndroidViewModel(application) {
     // Helpers
     // ═══════════════════════════════════════════════════════════════════════
     
+    private fun getString(resId: Int): String = getApplication<android.app.Application>().getString(resId)
+    
+    private fun getString(resId: Int, vararg formatArgs: Any): String = 
+        getApplication<android.app.Application>().getString(resId, *formatArgs)
+    
     fun isServerConfigured(): Boolean {
         val serverUrl = prefs.getString(Constants.KEY_SERVER_URL, null)
         return !serverUrl.isNullOrEmpty() && serverUrl != "http://" && serverUrl != "https://"

android/app/src/main/java/dev/dettmer/simplenotes/ui/main/components/DeleteConfirmationDialog.kt

@@ -14,7 +14,9 @@ import androidx.compose.material3.Text
 import androidx.compose.material3.TextButton
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.dp
+import dev.dettmer.simplenotes.R
 
 /**
  * Delete confirmation dialog with server/local options
@@ -28,15 +30,15 @@ fun DeleteConfirmationDialog(
     onDeleteEverywhere: () -> Unit
 ) {
     val title = if (noteCount == 1) {
-        "Notiz löschen?"
+        stringResource(R.string.delete_note_title)
     } else {
-        "$noteCount Notizen löschen?"
+        stringResource(R.string.delete_notes_title, noteCount)
     }
     
     val message = if (noteCount == 1) {
-        "Wie möchtest du diese Notiz löschen?"
+        stringResource(R.string.delete_note_message)
     } else {
-        "Wie möchtest du diese $noteCount Notizen löschen?"
+        stringResource(R.string.delete_notes_message, noteCount)
     }
     
     AlertDialog(
@@ -66,7 +68,7 @@ fun DeleteConfirmationDialog(
                         contentColor = MaterialTheme.colorScheme.error
                     )
                 ) {
-                    Text("Überall löschen (auch Server)")
+                    Text(stringResource(R.string.delete_everywhere))
                 }
                 
                 // Delete local only
@@ -74,7 +76,7 @@ fun DeleteConfirmationDialog(
                     onClick = onDeleteLocal,
                     modifier = Modifier.fillMaxWidth()
                 ) {
-                    Text("Nur lokal löschen")
+                    Text(stringResource(R.string.delete_local_only))
                 }
                 
                 Spacer(modifier = Modifier.height(8.dp))
@@ -84,7 +86,7 @@ fun DeleteConfirmationDialog(
                     onClick = onDismiss,
                     modifier = Modifier.fillMaxWidth()
                 ) {
-                    Text("Abbrechen")
+                    Text(stringResource(R.string.cancel))
                 }
             }
         },

android/app/src/main/java/dev/dettmer/simplenotes/ui/main/components/EmptyState.kt

@@ -14,9 +14,11 @@ import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
+import dev.dettmer.simplenotes.R
 
 /**
  * Empty state card shown when no notes exist
@@ -52,7 +54,7 @@ fun EmptyState(
                 
                 // Title
                 Text(
-                    text = "Noch keine Notizen",
+                    text = stringResource(R.string.empty_state_title),
                     style = MaterialTheme.typography.headlineSmall,
                     color = MaterialTheme.colorScheme.onSurface,
                     textAlign = TextAlign.Center
@@ -62,7 +64,7 @@ fun EmptyState(
                 
                 // Message
                 Text(
-                    text = "Tippe + um eine neue Notiz zu erstellen",
+                    text = stringResource(R.string.empty_state_message),
                     style = MaterialTheme.typography.bodyMedium,
                     color = MaterialTheme.colorScheme.onSurfaceVariant,
                     textAlign = TextAlign.Center

android/app/src/main/java/dev/dettmer/simplenotes/ui/main/components/NoteCard.kt

@@ -39,8 +39,12 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.input.pointer.pointerInput
+import androidx.compose.ui.input.pointer.pointerInput
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
+import dev.dettmer.simplenotes.R
 import dev.dettmer.simplenotes.models.Note
 import dev.dettmer.simplenotes.models.NoteType
 import dev.dettmer.simplenotes.models.SyncStatus
@@ -66,6 +70,7 @@ fun NoteCard(
     onClick: () -> Unit,
     onLongClick: () -> Unit
 ) {
+    val context = LocalContext.current
     val borderColor = if (isSelected) {
         MaterialTheme.colorScheme.primary
     } else {
@@ -137,7 +142,7 @@ fun NoteCard(
                     
                     // Title
                     Text(
-                        text = note.title.ifEmpty { "Ohne Titel" },
+                        text = note.title.ifEmpty { stringResource(R.string.untitled) },
                         style = MaterialTheme.typography.titleMedium,
                         color = MaterialTheme.colorScheme.onSurface,
                         maxLines = 2,
@@ -154,7 +159,7 @@ fun NoteCard(
                         NoteType.TEXT -> note.content.take(100)
                         NoteType.CHECKLIST -> {
                             val items = note.checklistItems ?: emptyList()
-                            "${items.count { it.isChecked }}/${items.size} erledigt"
+                            stringResource(R.string.checklist_progress, items.count { it.isChecked }, items.size)
                         }
                     },
                     style = MaterialTheme.typography.bodyMedium,
@@ -171,7 +176,7 @@ fun NoteCard(
                     verticalAlignment = Alignment.CenterVertically
                 ) {
                     Text(
-                        text = note.updatedAt.toReadableTime(),
+                        text = note.updatedAt.toReadableTime(context),
                         style = MaterialTheme.typography.labelSmall,
                         color = MaterialTheme.colorScheme.outline,
                         modifier = Modifier.weight(1f)
@@ -231,7 +236,7 @@ fun NoteCard(
                     if (isSelected) {
                         Icon(
                             imageVector = Icons.Default.Check,
-                            contentDescription = "Ausgewählt",
+                            contentDescription = stringResource(R.string.selection_count, 1),
                             tint = MaterialTheme.colorScheme.onPrimary,
                             modifier = Modifier.size(16.dp)
                         )

android/app/src/main/java/dev/dettmer/simplenotes/ui/main/components/NoteTypeFAB.kt

@@ -16,6 +16,8 @@ import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
+import dev.dettmer.simplenotes.R
 import dev.dettmer.simplenotes.models.NoteType
 
 /**
@@ -42,7 +44,7 @@ fun NoteTypeFAB(
     ) {
         Icon(
             imageVector = Icons.Default.Add,
-            contentDescription = "Neue Notiz"
+            contentDescription = stringResource(R.string.fab_new_note)
         )
         
         // Dropdown inside FAB - renders as popup overlay
@@ -51,7 +53,7 @@ fun NoteTypeFAB(
             onDismissRequest = { expanded = false }
         ) {
             DropdownMenuItem(
-                text = { Text("Text-Notiz") },
+                text = { Text(stringResource(R.string.fab_text_note)) },
                 leadingIcon = {
                     Icon(
                         imageVector = Icons.Outlined.Description,
@@ -65,7 +67,7 @@ fun NoteTypeFAB(
                 }
             )
             DropdownMenuItem(
-                text = { Text("Checkliste") },
+                text = { Text(stringResource(R.string.fab_checklist)) },
                 leadingIcon = {
                     Icon(
                         imageVector = Icons.AutoMirrored.Outlined.List,

android/app/src/main/java/dev/dettmer/simplenotes/ui/main/components/SyncStatusBanner.kt

@@ -16,7 +16,9 @@ import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.dp
+import dev.dettmer.simplenotes.R
 import dev.dettmer.simplenotes.sync.SyncStateManager
 
 /**
@@ -60,10 +62,10 @@ fun SyncStatusBanner(
             
             Text(
                 text = when (syncState) {
-                    SyncStateManager.SyncState.SYNCING -> "Synchronisiere..."
+                    SyncStateManager.SyncState.SYNCING -> stringResource(R.string.sync_status_syncing)
                     SyncStateManager.SyncState.SYNCING_SILENT -> "" // v1.5.0: Wird nicht angezeigt (isVisible = false)
-                    SyncStateManager.SyncState.COMPLETED -> message ?: "Synchronisiert"
+                    SyncStateManager.SyncState.COMPLETED -> message ?: stringResource(R.string.sync_status_completed)
-                    SyncStateManager.SyncState.ERROR -> message ?: "Fehler"
+                    SyncStateManager.SyncState.ERROR -> message ?: stringResource(R.string.sync_status_error)
                     SyncStateManager.SyncState.IDLE -> ""
                 },
                 style = MaterialTheme.typography.bodyMedium,

android/app/src/main/java/dev/dettmer/simplenotes/ui/settings/ComposeSettingsActivity.kt

@@ -7,16 +7,17 @@ import android.os.Bundle
 import android.os.PowerManager
 import android.provider.Settings
 import android.widget.Toast
-import androidx.activity.ComponentActivity
 import androidx.activity.OnBackPressedCallback
 import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
 import androidx.activity.viewModels
 import androidx.appcompat.app.AlertDialog
+import androidx.appcompat.app.AppCompatActivity
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.ui.platform.LocalContext
 import androidx.navigation.compose.rememberNavController
 import com.google.android.material.color.DynamicColors
+import dev.dettmer.simplenotes.R
 import dev.dettmer.simplenotes.SimpleNotesApplication
 import dev.dettmer.simplenotes.ui.theme.SimpleNotesTheme
 import dev.dettmer.simplenotes.utils.Logger
@@ -34,7 +35,7 @@ import kotlinx.coroutines.launch
  * - Navigation with back button in each screen
  * - Clean separation of concerns with SettingsViewModel
  */
-class ComposeSettingsActivity : ComponentActivity() {
+class ComposeSettingsActivity : AppCompatActivity() {
     
     companion object {
         private const val TAG = "ComposeSettingsActivity"
@@ -133,16 +134,12 @@ class ComposeSettingsActivity : ComponentActivity() {
      */
     private fun showBatteryOptimizationDialog() {
         AlertDialog.Builder(this)
-            .setTitle("Hintergrund-Synchronisation")
+            .setTitle(getString(R.string.battery_optimization_dialog_title))
-            .setMessage(
+            .setMessage(getString(R.string.battery_optimization_dialog_full_message))
-                "Damit die App im Hintergrund synchronisieren kann, " +
+            .setPositiveButton(getString(R.string.battery_optimization_open_settings)) { _, _ ->
-                "muss die Akku-Optimierung deaktiviert werden.\n\n" +
-                "Bitte wähle 'Nicht optimieren' für Simple Notes."
-            )
-            .setPositiveButton("Einstellungen öffnen") { _, _ ->
                 openBatteryOptimizationSettings()
             }
-            .setNegativeButton("Später") { dialog, _ ->
+            .setNegativeButton(getString(R.string.battery_optimization_later)) { dialog, _ ->
                 dialog.dismiss()
             }
             .setCancelable(false)

android/app/src/main/java/dev/dettmer/simplenotes/ui/settings/SettingsNavigation.kt

@@ -7,6 +7,7 @@ import androidx.navigation.compose.composable
 import dev.dettmer.simplenotes.ui.settings.screens.AboutScreen
 import dev.dettmer.simplenotes.ui.settings.screens.BackupSettingsScreen
 import dev.dettmer.simplenotes.ui.settings.screens.DebugSettingsScreen
+import dev.dettmer.simplenotes.ui.settings.screens.LanguageSettingsScreen
 import dev.dettmer.simplenotes.ui.settings.screens.MarkdownSettingsScreen
 import dev.dettmer.simplenotes.ui.settings.screens.ServerSettingsScreen
 import dev.dettmer.simplenotes.ui.settings.screens.SettingsMainScreen
@@ -35,6 +36,13 @@ fun SettingsNavHost(
             )
         }
         
+        // Language Settings
+        composable(SettingsRoute.Language.route) {
+            LanguageSettingsScreen(
+                onBack = { navController.popBackStack() }
+            )
+        }
+        
         // Server Settings
         composable(SettingsRoute.Server.route) {
             ServerSettingsScreen(

android/app/src/main/java/dev/dettmer/simplenotes/ui/settings/SettingsRoute.kt

@@ -6,6 +6,7 @@ package dev.dettmer.simplenotes.ui.settings
  */
 sealed class SettingsRoute(val route: String) {
     data object Main : SettingsRoute("settings_main")
+    data object Language : SettingsRoute("settings_language")
     data object Server : SettingsRoute("settings_server")
     data object Sync : SettingsRoute("settings_sync")
     data object Markdown : SettingsRoute("settings_markdown")

android/app/src/main/java/dev/dettmer/simplenotes/ui/settings/SettingsViewModel.kt

@@ -6,6 +6,7 @@ import android.net.Uri
 import android.util.Log
 import androidx.lifecycle.AndroidViewModel
 import androidx.lifecycle.viewModelScope
+import dev.dettmer.simplenotes.R
 import dev.dettmer.simplenotes.backup.BackupManager
 import dev.dettmer.simplenotes.backup.RestoreMode
 import dev.dettmer.simplenotes.sync.WebDavSyncService
@@ -184,10 +185,10 @@ class SettingsViewModel(application: Application) : AndroidViewModel(application
                 } else {
                     ServerStatus.Unreachable(result.errorMessage)
                 }
-                emitToast(if (result.isSuccess) "✅ Verbindung erfolgreich!" else "❌ ${result.errorMessage}")
+                emitToast(if (result.isSuccess) getString(R.string.toast_connection_success) else getString(R.string.toast_connection_failed, result.errorMessage ?: ""))
             } catch (e: Exception) {
                 _serverStatus.value = ServerStatus.Unreachable(e.message)
-                emitToast("❌ Fehler: ${e.message}")
+                emitToast(getString(R.string.toast_error, e.message ?: ""))
             }
         }
     }
@@ -225,22 +226,22 @@ class SettingsViewModel(application: Application) : AndroidViewModel(application
         viewModelScope.launch {
             _isSyncing.value = true
             try {
-                emitToast("🔄 Synchronisiere...")
+                emitToast(getString(R.string.toast_syncing))
                 val syncService = WebDavSyncService(getApplication())
                 
                 if (!syncService.hasUnsyncedChanges()) {
-                    emitToast("✅ Bereits synchronisiert")
+                    emitToast(getString(R.string.toast_already_synced))
                     return@launch
                 }
                 
                 val result = syncService.syncNotes()
                 if (result.isSuccess) {
-                    emitToast("✅ ${result.syncedCount} Notizen synchronisiert")
+                    emitToast(getString(R.string.toast_sync_success, result.syncedCount))
                 } else {
-                    emitToast("❌ ${result.errorMessage}")
+                    emitToast(getString(R.string.toast_sync_failed, result.errorMessage ?: ""))
                 }
             } catch (e: Exception) {
-                emitToast("❌ Fehler: ${e.message}")
+                emitToast(getString(R.string.toast_error, e.message ?: ""))
             } finally {
                 _isSyncing.value = false
             }
@@ -260,10 +261,10 @@ class SettingsViewModel(application: Application) : AndroidViewModel(application
                 // v1.5.0 Fix: Trigger battery optimization check and network monitor restart
                 _events.emit(SettingsEvent.RequestBatteryOptimization)
                 _events.emit(SettingsEvent.RestartNetworkMonitor)
-                emitToast("✅ Auto-Sync aktiviert")
+                emitToast(getString(R.string.toast_auto_sync_enabled))
             } else {
                 _events.emit(SettingsEvent.RestartNetworkMonitor)
-                emitToast("Auto-Sync deaktiviert")
+                emitToast(getString(R.string.toast_auto_sync_disabled))
             }
         }
     }
@@ -273,11 +274,11 @@ class SettingsViewModel(application: Application) : AndroidViewModel(application
         prefs.edit().putLong(Constants.PREF_SYNC_INTERVAL_MINUTES, minutes).apply()
         viewModelScope.launch {
             val text = when (minutes) {
-                15L -> "15 Minuten"
+                15L -> getString(R.string.toast_sync_interval_15min)
-                60L -> "60 Minuten"
+                60L -> getString(R.string.toast_sync_interval_60min)
-                else -> "30 Minuten"
+                else -> getString(R.string.toast_sync_interval_30min)
             }
-            emitToast("⏱️ Sync-Intervall: $text")
+            emitToast(getString(R.string.toast_sync_interval, text))
         }
     }
     
@@ -296,7 +297,7 @@ class SettingsViewModel(application: Application) : AndroidViewModel(application
                     val password = prefs.getString(Constants.KEY_PASSWORD, "") ?: ""
                     
                     if (serverUrl.isBlank() || username.isBlank() || password.isBlank()) {
-                        emitToast("⚠️ Bitte zuerst WebDAV-Server konfigurieren")
+                        emitToast(getString(R.string.toast_configure_server_first))
                         // Don't enable - revert state
                         return@launch
                     }
@@ -329,7 +330,7 @@ class SettingsViewModel(application: Application) : AndroidViewModel(application
                             .apply()
                         
                         _markdownExportProgress.value = MarkdownExportProgress(noteCount, noteCount, isComplete = true)
-                        emitToast("✅ $exportedCount Notizen nach Markdown exportiert")
+                        emitToast(getString(R.string.toast_markdown_exported, exportedCount))
                         
                         // Clear progress after short delay
                         kotlinx.coroutines.delay(500)
@@ -342,12 +343,12 @@ class SettingsViewModel(application: Application) : AndroidViewModel(application
                             .putBoolean(Constants.KEY_MARKDOWN_EXPORT, true)
                             .putBoolean(Constants.KEY_MARKDOWN_AUTO_IMPORT, true)
                             .apply()
-                        emitToast("📝 Markdown Auto-Sync aktiviert")
+                        emitToast(getString(R.string.toast_markdown_enabled))
                     }
                     
                 } catch (e: Exception) {
                     _markdownExportProgress.value = null
-                    emitToast("❌ Export fehlgeschlagen: ${e.message}")
+                    emitToast(getString(R.string.toast_export_failed, e.message ?: ""))
                     // Don't enable on error
                 }
             }
@@ -359,7 +360,7 @@ class SettingsViewModel(application: Application) : AndroidViewModel(application
                 .putBoolean(Constants.KEY_MARKDOWN_AUTO_IMPORT, false)
                 .apply()
             viewModelScope.launch {
-                emitToast("📝 Markdown Auto-Sync deaktiviert")
+                emitToast(getString(R.string.toast_markdown_disabled))
             }
         }
     }
@@ -367,12 +368,12 @@ class SettingsViewModel(application: Application) : AndroidViewModel(application
     fun performManualMarkdownSync() {
         viewModelScope.launch {
             try {
-                emitToast("📝 Markdown-Sync läuft...")
+                emitToast(getString(R.string.toast_markdown_syncing))
                 val syncService = WebDavSyncService(getApplication())
                 val result = syncService.manualMarkdownSync()
-                emitToast("✅ Export: ${result.exportedCount} • Import: ${result.importedCount}")
+                emitToast(getString(R.string.toast_markdown_result, result.exportedCount, result.importedCount))
             } catch (e: Exception) {
-                emitToast("❌ Fehler: ${e.message}")
+                emitToast(getString(R.string.toast_error, e.message ?: ""))
             }
         }
     }
@@ -386,9 +387,9 @@ class SettingsViewModel(application: Application) : AndroidViewModel(application
             _isBackupInProgress.value = true
             try {
                 val result = backupManager.createBackup(uri)
-                emitToast(if (result.success) "✅ ${result.message}" else "❌ ${result.error}")
+                emitToast(if (result.success) getString(R.string.toast_backup_success, result.message ?: "") else getString(R.string.toast_backup_failed, result.error ?: ""))
             } catch (e: Exception) {
-                emitToast("❌ Backup fehlgeschlagen: ${e.message}")
+                emitToast(getString(R.string.toast_backup_failed, e.message ?: ""))
             } finally {
                 _isBackupInProgress.value = false
             }
@@ -400,9 +401,9 @@ class SettingsViewModel(application: Application) : AndroidViewModel(application
             _isBackupInProgress.value = true
             try {
                 val result = backupManager.restoreBackup(uri, mode)
-                emitToast(if (result.success) "✅ ${result.importedNotes} Notizen wiederhergestellt" else "❌ ${result.error}")
+                emitToast(if (result.success) getString(R.string.toast_restore_success, result.importedNotes) else getString(R.string.toast_restore_failed, result.error ?: ""))
             } catch (e: Exception) {
-                emitToast("❌ Wiederherstellung fehlgeschlagen: ${e.message}")
+                emitToast(getString(R.string.toast_restore_failed, e.message ?: ""))
             } finally {
                 _isBackupInProgress.value = false
             }
@@ -413,14 +414,14 @@ class SettingsViewModel(application: Application) : AndroidViewModel(application
         viewModelScope.launch {
             _isBackupInProgress.value = true
             try {
-                emitToast("📥 Lade vom Server...")
+                emitToast(getString(R.string.restore_progress))
                 val syncService = WebDavSyncService(getApplication())
                 val result = withContext(Dispatchers.IO) {
                     syncService.restoreFromServer(mode)
                 }
-                emitToast(if (result.isSuccess) "✅ ${result.restoredCount} Notizen wiederhergestellt" else "❌ ${result.errorMessage}")
+                emitToast(if (result.isSuccess) getString(R.string.toast_restore_success, result.restoredCount) else getString(R.string.toast_restore_failed, result.errorMessage ?: ""))
             } catch (e: Exception) {
-                emitToast("❌ Fehler: ${e.message}")
+                emitToast(getString(R.string.toast_error, e.message ?: ""))
             } finally {
                 _isBackupInProgress.value = false
             }
@@ -436,7 +437,7 @@ class SettingsViewModel(application: Application) : AndroidViewModel(application
         prefs.edit().putBoolean(Constants.KEY_FILE_LOGGING_ENABLED, enabled).apply()
         Logger.setFileLoggingEnabled(enabled)
         viewModelScope.launch {
-            emitToast(if (enabled) "📝 Datei-Logging aktiviert" else "📝 Datei-Logging deaktiviert")
+            emitToast(if (enabled) getString(R.string.toast_file_logging_enabled) else getString(R.string.toast_file_logging_disabled))
         }
     }
     
@@ -444,9 +445,9 @@ class SettingsViewModel(application: Application) : AndroidViewModel(application
         viewModelScope.launch {
             try {
                 val cleared = Logger.clearLogFile(getApplication())
-                emitToast(if (cleared) "🗑️ Logs gelöscht" else "📭 Keine Logs zum Löschen")
+                emitToast(if (cleared) getString(R.string.toast_logs_deleted) else getString(R.string.toast_logs_deleted))
             } catch (e: Exception) {
-                emitToast("❌ Fehler: ${e.message}")
+                emitToast(getString(R.string.toast_error, e.message ?: ""))
             }
         }
     }
@@ -457,6 +458,11 @@ class SettingsViewModel(application: Application) : AndroidViewModel(application
     // Helper
     // ═══════════════════════════════════════════════════════════════════════
     
+    private fun getString(resId: Int): String = getApplication<android.app.Application>().getString(resId)
+    
+    private fun getString(resId: Int, vararg formatArgs: Any): String = 
+        getApplication<android.app.Application>().getString(resId, *formatArgs)
+    
     private suspend fun emitToast(message: String) {
         _showToast.emit(message)
     }

android/app/src/main/java/dev/dettmer/simplenotes/ui/settings/components/SettingsScaffold.kt

@@ -13,6 +13,8 @@ import androidx.compose.material3.TopAppBar
 import androidx.compose.material3.TopAppBarDefaults
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
+import dev.dettmer.simplenotes.R
 
 /**
  * Reusable Scaffold with back-navigation TopAppBar
@@ -40,7 +42,7 @@ fun SettingsScaffold(
                     IconButton(onClick = onBack) {
                         Icon(
                             imageVector = Icons.AutoMirrored.Filled.ArrowBack,
-                            contentDescription = "Zurück"
+                            contentDescription = stringResource(R.string.content_description_back)
                         )
                     }
                 },

android/app/src/main/java/dev/dettmer/simplenotes/ui/settings/screens/AboutScreen.kt

@@ -37,9 +37,11 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.asImageBitmap
 import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import dev.dettmer.simplenotes.BuildConfig
+import dev.dettmer.simplenotes.R
 import dev.dettmer.simplenotes.ui.settings.components.SettingsDivider
 import dev.dettmer.simplenotes.ui.settings.components.SettingsScaffold
 import dev.dettmer.simplenotes.ui.settings.components.SettingsSectionHeader
@@ -59,7 +61,7 @@ fun AboutScreen(
     val licenseUrl = "https://github.com/inventory69/simple-notes-sync/blob/main/LICENSE"
     
     SettingsScaffold(
-        title = "Über diese App",
+        title = stringResource(R.string.about_settings_title),
         onBack = onBack
     ) { paddingValues ->
         Column(
@@ -110,7 +112,7 @@ fun AboutScreen(
                     Spacer(modifier = Modifier.height(8.dp))
                     
                     Text(
-                        text = "Simple Notes Sync",
+                        text = stringResource(R.string.about_app_name),
                         style = MaterialTheme.typography.headlineSmall,
                         color = MaterialTheme.colorScheme.onPrimaryContainer
                     )
@@ -118,7 +120,7 @@ fun AboutScreen(
                     Spacer(modifier = Modifier.height(4.dp))
                     
                     Text(
-                        text = "Version ${BuildConfig.VERSION_NAME} (${BuildConfig.VERSION_CODE})",
+                        text = stringResource(R.string.about_version, BuildConfig.VERSION_NAME, BuildConfig.VERSION_CODE),
                         style = MaterialTheme.typography.bodyMedium,
                         color = MaterialTheme.colorScheme.onPrimaryContainer.copy(alpha = 0.8f)
                     )
@@ -127,13 +129,13 @@ fun AboutScreen(
             
             Spacer(modifier = Modifier.height(24.dp))
             
-            SettingsSectionHeader(text = "Links")
+            SettingsSectionHeader(text = stringResource(R.string.about_links_section))
             
             // GitHub Repository
             AboutLinkItem(
                 icon = Icons.Default.Code,
-                title = "GitHub Repository",
+                title = stringResource(R.string.about_github_title),
-                subtitle = "Quellcode, Issues & Dokumentation",
+                subtitle = stringResource(R.string.about_github_subtitle),
                 onClick = {
                     val intent = Intent(Intent.ACTION_VIEW, Uri.parse(githubRepoUrl))
                     context.startActivity(intent)
@@ -143,8 +145,8 @@ fun AboutScreen(
             // Developer
             AboutLinkItem(
                 icon = Icons.Default.Person,
-                title = "Entwickler",
+                title = stringResource(R.string.about_developer_title),
-                subtitle = "GitHub Profil: @inventory69",
+                subtitle = stringResource(R.string.about_developer_subtitle),
                 onClick = {
                     val intent = Intent(Intent.ACTION_VIEW, Uri.parse(githubProfileUrl))
                     context.startActivity(intent)
@@ -154,8 +156,8 @@ fun AboutScreen(
             // License
             AboutLinkItem(
                 icon = Icons.Default.Policy,
-                title = "Lizenz",
+                title = stringResource(R.string.about_license_title),
-                subtitle = "MIT License - Open Source",
+                subtitle = stringResource(R.string.about_license_subtitle),
                 onClick = {
                     val intent = Intent(Intent.ACTION_VIEW, Uri.parse(licenseUrl))
                     context.startActivity(intent)
@@ -177,14 +179,12 @@ fun AboutScreen(
                     modifier = Modifier.padding(16.dp)
                 ) {
                     Text(
-                        text = "🔒 Datenschutz",
+                        text = stringResource(R.string.about_privacy_title),
                         style = MaterialTheme.typography.titleSmall
                     )
                     Spacer(modifier = Modifier.height(8.dp))
                     Text(
-                        text = "Diese App sammelt keine Daten. Alle Notizen werden " +
+                        text = stringResource(R.string.about_privacy_text),
-                            "nur lokal auf deinem Gerät und auf deinem eigenen " +
-                            "WebDAV-Server gespeichert. Keine Telemetrie, keine Werbung.",
                         style = MaterialTheme.typography.bodySmall,
                         color = MaterialTheme.colorScheme.onSurfaceVariant
                     )

android/app/src/main/java/dev/dettmer/simplenotes/ui/settings/screens/BackupSettingsScreen.kt

@@ -21,7 +21,9 @@ import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.dp
+import dev.dettmer.simplenotes.R
 import dev.dettmer.simplenotes.backup.RestoreMode
 import dev.dettmer.simplenotes.ui.settings.SettingsViewModel
 import dev.dettmer.simplenotes.ui.settings.components.RadioOption
@@ -71,7 +73,7 @@ fun BackupSettingsScreen(
     }
     
     SettingsScaffold(
-        title = "Backup & Wiederherstellung",
+        title = stringResource(R.string.backup_settings_title),
         onBack = onBack
     ) { paddingValues ->
         Column(
@@ -84,19 +86,18 @@ fun BackupSettingsScreen(
             
             // Info Card
             SettingsInfoCard(
-                text = "📦 Bei jeder Wiederherstellung wird automatisch ein " +
+                text = stringResource(R.string.backup_auto_info)
-                    "Sicherheits-Backup erstellt."
             )
             
             Spacer(modifier = Modifier.height(16.dp))
             
             // Local Backup Section
-            SettingsSectionHeader(text = "Lokales Backup")
+            SettingsSectionHeader(text = stringResource(R.string.backup_local_section))
             
             Spacer(modifier = Modifier.height(8.dp))
             
             SettingsButton(
-                text = "💾 Backup erstellen",
+                text = stringResource(R.string.backup_create),
                 onClick = {
                     val timestamp = SimpleDateFormat("yyyy-MM-dd_HHmmss", Locale.US)
                         .format(Date())
@@ -110,7 +111,7 @@ fun BackupSettingsScreen(
             Spacer(modifier = Modifier.height(8.dp))
             
             SettingsOutlinedButton(
-                text = "📂 Aus Datei wiederherstellen",
+                text = stringResource(R.string.backup_restore_file),
                 onClick = {
                     restoreFileLauncher.launch(arrayOf("application/json"))
                 },
@@ -121,12 +122,12 @@ fun BackupSettingsScreen(
             SettingsDivider()
             
             // Server Backup Section
-            SettingsSectionHeader(text = "Server-Backup")
+            SettingsSectionHeader(text = stringResource(R.string.backup_server_section))
             
             Spacer(modifier = Modifier.height(8.dp))
             
             SettingsOutlinedButton(
-                text = "☁️ Vom Server wiederherstellen",
+                text = stringResource(R.string.backup_restore_server),
                 onClick = {
                     restoreSource = RestoreSource.Server
                     showRestoreDialog = true
@@ -186,42 +187,42 @@ private fun RestoreModeDialog(
     onDismiss: () -> Unit
 ) {
     val sourceText = when (source) {
-        RestoreSource.LocalFile -> "Lokale Datei"
+        RestoreSource.LocalFile -> stringResource(R.string.backup_restore_source_file)
-        RestoreSource.Server -> "WebDAV Server"
+        RestoreSource.Server -> stringResource(R.string.backup_restore_source_server)
     }
     
     val modeOptions = listOf(
         RadioOption(
             value = RestoreMode.MERGE,
-            title = "⚪ Zusammenführen (Standard)",
+            title = stringResource(R.string.backup_mode_merge_title),
-            subtitle = "Neue hinzufügen, Bestehende behalten"
+            subtitle = stringResource(R.string.backup_mode_merge_subtitle)
         ),
         RadioOption(
             value = RestoreMode.REPLACE,
-            title = "⚪ Ersetzen",
+            title = stringResource(R.string.backup_mode_replace_title),
-            subtitle = "Alle löschen & Backup importieren"
+            subtitle = stringResource(R.string.backup_mode_replace_subtitle)
         ),
         RadioOption(
             value = RestoreMode.OVERWRITE_DUPLICATES,
-            title = "⚪ Duplikate überschreiben",
+            title = stringResource(R.string.backup_mode_overwrite_title),
-            subtitle = "Backup gewinnt bei Konflikten"
+            subtitle = stringResource(R.string.backup_mode_overwrite_subtitle)
         )
     )
     
     AlertDialog(
         onDismissRequest = onDismiss,
-        title = { Text("⚠️ Backup wiederherstellen?") },
+        title = { Text(stringResource(R.string.backup_restore_dialog_title)) },
         text = {
             Column {
                 Text(
-                    text = "Quelle: $sourceText",
+                    text = stringResource(R.string.backup_restore_source, sourceText),
                     style = MaterialTheme.typography.bodyMedium
                 )
                 
                 Spacer(modifier = Modifier.height(16.dp))
                 
                 Text(
-                    text = "Wiederherstellungs-Modus:",
+                    text = stringResource(R.string.backup_restore_mode_label),
                     style = MaterialTheme.typography.labelLarge
                 )
                 
@@ -236,7 +237,7 @@ private fun RestoreModeDialog(
                 Spacer(modifier = Modifier.height(8.dp))
                 
                 Text(
-                    text = "ℹ️ Ein Sicherheits-Backup wird vor dem Wiederherstellen automatisch erstellt.",
+                    text = stringResource(R.string.backup_restore_info),
                     style = MaterialTheme.typography.bodySmall,
                     color = MaterialTheme.colorScheme.onSurfaceVariant
                 )
@@ -244,12 +245,12 @@ private fun RestoreModeDialog(
         },
         confirmButton = {
             TextButton(onClick = onConfirm) {
-                Text("Wiederherstellen")
+                Text(stringResource(R.string.backup_restore_button))
             }
         },
         dismissButton = {
             TextButton(onClick = onDismiss) {
-                Text("Abbrechen")
+                Text(stringResource(R.string.cancel))
             }
         }
     )

android/app/src/main/java/dev/dettmer/simplenotes/ui/settings/screens/DebugSettingsScreen.kt

@@ -21,9 +21,11 @@ import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.dp
 import androidx.core.content.FileProvider
 import dev.dettmer.simplenotes.BuildConfig
+import dev.dettmer.simplenotes.R
 import dev.dettmer.simplenotes.ui.settings.SettingsViewModel
 import dev.dettmer.simplenotes.ui.settings.components.SettingsButton
 import dev.dettmer.simplenotes.ui.settings.components.SettingsDangerButton
@@ -48,7 +50,7 @@ fun DebugSettingsScreen(
     var showClearLogsDialog by remember { mutableStateOf(false) }
     
     SettingsScaffold(
-        title = "Debug & Diagnose",
+        title = stringResource(R.string.debug_settings_title),
         onBack = onBack
     ) { paddingValues ->
         Column(
@@ -61,8 +63,8 @@ fun DebugSettingsScreen(
             
             // File Logging Toggle
             SettingsSwitch(
-                title = "Datei-Logging",
+                title = stringResource(R.string.debug_file_logging_title),
-                subtitle = "Sync-Logs in Datei speichern",
+                subtitle = stringResource(R.string.debug_file_logging_subtitle),
                 checked = fileLoggingEnabled,
                 onCheckedChange = { viewModel.setFileLogging(it) },
                 icon = Icons.AutoMirrored.Filled.Notes
@@ -70,21 +72,18 @@ fun DebugSettingsScreen(
             
             // Privacy Info
             SettingsInfoCard(
-                text = "🔒 Datenschutz: Logs werden nur lokal auf deinem Gerät gespeichert " +
+                text = stringResource(R.string.debug_privacy_info)
-                    "und niemals an externe Server gesendet. Die Logs enthalten " +
-                    "Sync-Aktivitäten zur Fehlerdiagnose. Du kannst sie jederzeit löschen " +
-                    "oder exportieren."
             )
             
             SettingsDivider()
             
-            SettingsSectionHeader(text = "Log-Aktionen")
+            SettingsSectionHeader(text = stringResource(R.string.debug_log_actions_section))
             
             Spacer(modifier = Modifier.height(8.dp))
             
             // Export Logs Button
             SettingsButton(
-                text = "📤 Logs exportieren & teilen",
+                text = stringResource(R.string.debug_export_logs),
                 onClick = {
                     val logFile = viewModel.getLogFile()
                     if (logFile != null && logFile.exists() && logFile.length() > 0L) {
@@ -97,11 +96,11 @@ fun DebugSettingsScreen(
                         val shareIntent = Intent(Intent.ACTION_SEND).apply {
                             type = "text/plain"
                             putExtra(Intent.EXTRA_STREAM, logUri)
-                            putExtra(Intent.EXTRA_SUBJECT, "SimpleNotes Sync Logs")
+                            putExtra(Intent.EXTRA_SUBJECT, context.getString(R.string.debug_logs_subject))
                             addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
                         }
                         
-                        context.startActivity(Intent.createChooser(shareIntent, "Logs teilen via..."))
+                        context.startActivity(Intent.createChooser(shareIntent, context.getString(R.string.debug_logs_share_via)))
                     }
                 },
                 modifier = Modifier.padding(horizontal = 16.dp)
@@ -111,7 +110,7 @@ fun DebugSettingsScreen(
             
             // Clear Logs Button
             SettingsDangerButton(
-                text = "🗑️ Logs löschen",
+                text = stringResource(R.string.debug_delete_logs),
                 onClick = { showClearLogsDialog = true },
                 modifier = Modifier.padding(horizontal = 16.dp)
             )
@@ -124,9 +123,9 @@ fun DebugSettingsScreen(
     if (showClearLogsDialog) {
         AlertDialog(
             onDismissRequest = { showClearLogsDialog = false },
-            title = { Text("Logs löschen?") },
+            title = { Text(stringResource(R.string.debug_delete_logs_title)) },
             text = {
-                Text("Alle gespeicherten Sync-Logs werden unwiderruflich gelöscht.")
+                Text(stringResource(R.string.debug_delete_logs_message))
             },
             confirmButton = {
                 TextButton(
@@ -135,12 +134,12 @@ fun DebugSettingsScreen(
                         viewModel.clearLogs()
                     }
                 ) {
-                    Text("Löschen")
+                    Text(stringResource(R.string.delete))
                 }
             },
             dismissButton = {
                 TextButton(onClick = { showClearLogsDialog = false }) {
-                    Text("Abbrechen")
+                    Text(stringResource(R.string.cancel))
                 }
             }
         )

android/app/src/main/java/dev/dettmer/simplenotes/ui/settings/screens/LanguageSettingsScreen.kt

@@ -0,0 +1,120 @@
+package dev.dettmer.simplenotes.ui.settings.screens
+
+import android.app.Activity
+import androidx.appcompat.app.AppCompatDelegate
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.unit.dp
+import androidx.core.os.LocaleListCompat
+import dev.dettmer.simplenotes.R
+import dev.dettmer.simplenotes.ui.settings.components.RadioOption
+import dev.dettmer.simplenotes.ui.settings.components.SettingsInfoCard
+import dev.dettmer.simplenotes.ui.settings.components.SettingsRadioGroup
+import dev.dettmer.simplenotes.ui.settings.components.SettingsScaffold
+
+/**
+ * Language selection settings screen
+ * v1.5.0: Internationalization feature
+ * 
+ * Uses Android's Per-App Language API (Android 13+) with AppCompat fallback
+ */
+@Composable
+fun LanguageSettingsScreen(
+    onBack: () -> Unit
+) {
+    val context = LocalContext.current
+    
+    // Get current app locale - fresh value each time (no remember, always reads current state)
+    val currentLocale = AppCompatDelegate.getApplicationLocales()
+    val currentLanguageCode = if (currentLocale.isEmpty) {
+        "" // System default
+    } else {
+        currentLocale.get(0)?.language ?: ""
+    }
+    
+    var selectedLanguage by remember(currentLanguageCode) { mutableStateOf(currentLanguageCode) }
+    
+    // Language options
+    val languageOptions = listOf(
+        RadioOption(
+            value = "",
+            title = stringResource(R.string.language_system_default),
+            subtitle = null
+        ),
+        RadioOption(
+            value = "en",
+            title = stringResource(R.string.language_english),
+            subtitle = "English"
+        ),
+        RadioOption(
+            value = "de",
+            title = stringResource(R.string.language_german),
+            subtitle = "German"
+        )
+    )
+    
+    SettingsScaffold(
+        title = stringResource(R.string.language_settings_title),
+        onBack = onBack
+    ) { paddingValues ->
+        Column(
+            modifier = Modifier
+                .fillMaxSize()
+                .padding(paddingValues)
+                .verticalScroll(rememberScrollState())
+        ) {
+            Spacer(modifier = Modifier.height(8.dp))
+            
+            // Info card
+            SettingsInfoCard(
+                text = stringResource(R.string.language_info)
+            )
+            
+            Spacer(modifier = Modifier.height(8.dp))
+            
+            // Language selection radio group
+            SettingsRadioGroup(
+                options = languageOptions,
+                selectedValue = selectedLanguage,
+                onValueSelected = { newLanguage ->
+                    if (newLanguage != selectedLanguage) {
+                        selectedLanguage = newLanguage
+                        setAppLanguage(newLanguage, context as Activity)
+                    }
+                }
+            )
+        }
+    }
+}
+
+/**
+ * Set app language using AppCompatDelegate
+ * Works on Android 13+ natively, falls back to AppCompat on older versions
+ */
+private fun setAppLanguage(languageCode: String, activity: Activity) {
+    val localeList = if (languageCode.isEmpty()) {
+        LocaleListCompat.getEmptyLocaleList()
+    } else {
+        LocaleListCompat.forLanguageTags(languageCode)
+    }
+    
+    AppCompatDelegate.setApplicationLocales(localeList)
+    
+    // Restart the activity to apply the change
+    // On Android 13+ the system handles this automatically for some apps,
+    // but we need to recreate to ensure our Compose UI recomposes with new locale
+    activity.recreate()
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/settings/screens/MarkdownSettingsScreen.kt

@@ -20,7 +20,9 @@ import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.dp
+import dev.dettmer.simplenotes.R
 import dev.dettmer.simplenotes.ui.settings.SettingsViewModel
 import dev.dettmer.simplenotes.ui.settings.components.SettingsButton
 import dev.dettmer.simplenotes.ui.settings.components.SettingsDivider
@@ -44,7 +46,7 @@ fun MarkdownSettingsScreen(
     exportProgress?.let { progress ->
         AlertDialog(
             onDismissRequest = { /* Not dismissable */ },
-            title = { Text("Markdown Auto-Sync") },
+            title = { Text(stringResource(R.string.markdown_dialog_title)) },
             text = {
                 Column(
                     modifier = Modifier.fillMaxWidth(),
@@ -53,9 +55,9 @@ fun MarkdownSettingsScreen(
                 ) {
                     Text(
                         text = if (progress.isComplete) {
-                            "✅ Export abgeschlossen"
+                            stringResource(R.string.markdown_export_complete)
                         } else {
-                            "Exportiere ${progress.current}/${progress.total} Notizen..."
+                            stringResource(R.string.markdown_export_progress, progress.current, progress.total)
                         },
                         style = MaterialTheme.typography.bodyMedium
                     )
@@ -75,7 +77,7 @@ fun MarkdownSettingsScreen(
     }
     
     SettingsScaffold(
-        title = "Markdown Desktop-Integration",
+        title = stringResource(R.string.markdown_settings_title),
         onBack = onBack
     ) { paddingValues ->
         Column(
@@ -88,17 +90,15 @@ fun MarkdownSettingsScreen(
             
             // Info Card
             SettingsInfoCard(
-                text = "📝 Exportiert Notizen zusätzlich als .md-Dateien. Mounte " +
+                text = stringResource(R.string.markdown_info)
-                    "WebDAV als Netzlaufwerk um mit VS Code, Typora oder jedem " +
-                    "Markdown-Editor zu bearbeiten. JSON-Sync bleibt primäres Format."
             )
             
             Spacer(modifier = Modifier.height(8.dp))
             
             // Markdown Auto-Sync Toggle
             SettingsSwitch(
-                title = "Markdown Auto-Sync",
+                title = stringResource(R.string.markdown_auto_sync_title),
-                subtitle = "Synchronisiert Notizen automatisch als .md-Dateien (Upload + Download bei jedem Sync)",
+                subtitle = stringResource(R.string.markdown_auto_sync_subtitle),
                 checked = markdownAutoSync,
                 onCheckedChange = { viewModel.setMarkdownAutoSync(it) },
                 icon = Icons.Default.Description
@@ -109,14 +109,13 @@ fun MarkdownSettingsScreen(
                 SettingsDivider()
                 
                 SettingsInfoCard(
-                    text = "Manueller Sync exportiert alle Notizen als .md-Dateien und " +
+                    text = stringResource(R.string.markdown_manual_sync_info)
-                        "importiert .md-Dateien vom Server. Nützlich für einmalige Synchronisation."
                 )
                 
                 Spacer(modifier = Modifier.height(8.dp))
                 
                 SettingsButton(
-                    text = "📝 Manueller Markdown-Sync",
+                    text = stringResource(R.string.markdown_manual_sync_button),
                     onClick = { viewModel.performManualMarkdownSync() },
                     modifier = Modifier.padding(horizontal = 16.dp)
                 )

android/app/src/main/java/dev/dettmer/simplenotes/ui/settings/screens/ServerSettingsScreen.kt

@@ -41,9 +41,11 @@ import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.text.input.KeyboardType
+import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.input.PasswordVisualTransformation
 import androidx.compose.ui.text.input.VisualTransformation
 import androidx.compose.ui.unit.dp
+import dev.dettmer.simplenotes.R
 import dev.dettmer.simplenotes.ui.settings.SettingsViewModel
 import dev.dettmer.simplenotes.ui.settings.components.SettingsScaffold
 
@@ -71,7 +73,7 @@ fun ServerSettingsScreen(
     }
     
     SettingsScaffold(
-        title = "Server-Einstellungen",
+        title = stringResource(R.string.server_settings_title),
         onBack = onBack
     ) { paddingValues ->
         Column(
@@ -83,7 +85,7 @@ fun ServerSettingsScreen(
         ) {
             // Verbindungstyp
             Text(
-                text = "Verbindungstyp",
+                text = stringResource(R.string.server_connection_type),
                 style = MaterialTheme.typography.labelLarge,
                 modifier = Modifier.padding(bottom = 8.dp)
             )
@@ -95,22 +97,22 @@ fun ServerSettingsScreen(
                 FilterChip(
                     selected = !isHttps,
                     onClick = { viewModel.updateProtocol(false) },
-                    label = { Text("🏠 Intern (HTTP)") },
+                    label = { Text(stringResource(R.string.server_connection_http)) },
                     modifier = Modifier.weight(1f)
                 )
                 FilterChip(
                     selected = isHttps,
                     onClick = { viewModel.updateProtocol(true) },
-                    label = { Text("🌐 Extern (HTTPS)") },
+                    label = { Text(stringResource(R.string.server_connection_https)) },
                     modifier = Modifier.weight(1f)
                 )
             }
             
             Text(
                 text = if (!isHttps) {
-                    "HTTP nur für lokale Netzwerke (z.B. 192.168.x.x, 10.x.x.x)"
+                    stringResource(R.string.server_connection_http_hint)
                 } else {
-                    "HTTPS für sichere Verbindungen über das Internet"
+                    stringResource(R.string.server_connection_https_hint)
                 },
                 style = MaterialTheme.typography.bodySmall,
                 color = MaterialTheme.colorScheme.onSurfaceVariant,
@@ -121,8 +123,8 @@ fun ServerSettingsScreen(
             OutlinedTextField(
                 value = serverUrl,
                 onValueChange = { viewModel.updateServerUrl(it) },
-                label = { Text("Server-Adresse") },
+                label = { Text(stringResource(R.string.server_address)) },
-                supportingText = { Text("z.B. http://192.168.0.188:8080/notes") },
+                supportingText = { Text(stringResource(R.string.server_address_hint)) },
                 leadingIcon = { Icon(Icons.Default.Language, null) },
                 modifier = Modifier.fillMaxWidth(),
                 singleLine = true,
@@ -135,7 +137,7 @@ fun ServerSettingsScreen(
             OutlinedTextField(
                 value = username,
                 onValueChange = { viewModel.updateUsername(it) },
-                label = { Text("Benutzername") },
+                label = { Text(stringResource(R.string.username)) },
                 leadingIcon = { Icon(Icons.Default.Person, null) },
                 modifier = Modifier.fillMaxWidth(),
                 singleLine = true
@@ -147,7 +149,7 @@ fun ServerSettingsScreen(
             OutlinedTextField(
                 value = password,
                 onValueChange = { viewModel.updatePassword(it) },
-                label = { Text("Passwort") },
+                label = { Text(stringResource(R.string.password)) },
                 leadingIcon = { Icon(Icons.Default.Lock, null) },
                 trailingIcon = {
                     IconButton(onClick = { passwordVisible = !passwordVisible }) {
@@ -157,7 +159,7 @@ fun ServerSettingsScreen(
                             } else {
                                 Icons.Default.Visibility
                             },
-                            contentDescription = if (passwordVisible) "Verstecken" else "Anzeigen"
+                            contentDescription = if (passwordVisible) stringResource(R.string.server_password_hide) else stringResource(R.string.server_password_show)
                         )
                     }
                 },
@@ -187,14 +189,14 @@ fun ServerSettingsScreen(
                     horizontalArrangement = Arrangement.SpaceBetween,
                     verticalAlignment = Alignment.CenterVertically
                 ) {
-                    Text("Server-Status:", style = MaterialTheme.typography.labelLarge)
+                    Text(stringResource(R.string.server_status_label), style = MaterialTheme.typography.labelLarge)
                     Text(
                         text = when (serverStatus) {
-                            is SettingsViewModel.ServerStatus.Reachable -> "✅ Erreichbar"
+                            is SettingsViewModel.ServerStatus.Reachable -> stringResource(R.string.server_status_reachable)
-                            is SettingsViewModel.ServerStatus.Unreachable -> "❌ Nicht erreichbar"
+                            is SettingsViewModel.ServerStatus.Unreachable -> stringResource(R.string.server_status_unreachable)
-                            is SettingsViewModel.ServerStatus.Checking -> "🔍 Prüfe..."
+                            is SettingsViewModel.ServerStatus.Checking -> stringResource(R.string.server_status_checking)
-                            is SettingsViewModel.ServerStatus.NotConfigured -> "⚠️ Nicht konfiguriert"
+                            is SettingsViewModel.ServerStatus.NotConfigured -> stringResource(R.string.server_status_not_configured)
-                            else -> "❓ Unbekannt"
+                            else -> stringResource(R.string.server_status_unknown)
                         },
                         color = when (serverStatus) {
                             is SettingsViewModel.ServerStatus.Reachable -> Color(0xFF4CAF50)
@@ -217,7 +219,7 @@ fun ServerSettingsScreen(
                     onClick = { viewModel.testConnection() },
                     modifier = Modifier.weight(1f)
                 ) {
-                    Text("Verbindung testen")
+                    Text(stringResource(R.string.test_connection))
                 }
                 
                 Button(
@@ -233,7 +235,7 @@ fun ServerSettingsScreen(
                         )
                         Spacer(modifier = Modifier.width(8.dp))
                     }
-                    Text("Jetzt synchronisieren")
+                    Text(stringResource(R.string.sync_now))
                 }
             }
         }

android/app/src/main/java/dev/dettmer/simplenotes/ui/settings/screens/SettingsMainScreen.kt

@@ -1,5 +1,6 @@
 package dev.dettmer.simplenotes.ui.settings.screens
 
+import androidx.appcompat.app.AppCompatDelegate
 import androidx.compose.foundation.layout.PaddingValues
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.padding
@@ -10,6 +11,7 @@ import androidx.compose.material.icons.filled.BugReport
 import androidx.compose.material.icons.filled.Cloud
 import androidx.compose.material.icons.filled.Description
 import androidx.compose.material.icons.filled.Info
+import androidx.compose.material.icons.filled.Language
 import androidx.compose.material.icons.filled.Sync
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
@@ -17,8 +19,10 @@ import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.dp
 import dev.dettmer.simplenotes.BuildConfig
+import dev.dettmer.simplenotes.R
 import dev.dettmer.simplenotes.ui.settings.SettingsRoute
 import dev.dettmer.simplenotes.ui.settings.SettingsViewModel
 import dev.dettmer.simplenotes.ui.settings.components.SettingsCard
@@ -46,8 +50,18 @@ fun SettingsMainScreen(
         viewModel.checkServerStatus()
     }
     
+    // Get current language for display (no remember - always fresh value after activity recreate)
+    val locales = AppCompatDelegate.getApplicationLocales()
+    val currentLanguageName = if (locales.isEmpty) {
+        null // System default
+    } else {
+        locales[0]?.displayLanguage?.replaceFirstChar { it.uppercase() }
+    }
+    val systemDefaultText = stringResource(R.string.language_system_default)
+    val languageSubtitle = currentLanguageName ?: systemDefaultText
+    
     SettingsScaffold(
-        title = "Einstellungen",
+        title = stringResource(R.string.settings_title),
         onBack = onBack
     ) { paddingValues ->
         LazyColumn(
@@ -56,6 +70,16 @@ fun SettingsMainScreen(
                 .padding(paddingValues),
             contentPadding = PaddingValues(vertical = 8.dp)
         ) {
+            // Language Settings
+            item {
+                SettingsCard(
+                    icon = Icons.Default.Language,
+                    title = stringResource(R.string.settings_language),
+                    subtitle = languageSubtitle,
+                    onClick = { onNavigate(SettingsRoute.Language) }
+                )
+            }
+            
             // Server-Einstellungen
             item {
                 // v1.5.0 Fix: Nur Prefix-URLs gelten als "nicht konfiguriert"
@@ -65,13 +89,13 @@ fun SettingsMainScreen(
                 
                 SettingsCard(
                     icon = Icons.Default.Cloud,
-                    title = "Server-Einstellungen",
+                    title = stringResource(R.string.settings_server),
                     subtitle = if (isConfigured) serverUrl else null,
                     statusText = when (serverStatus) {
-                        is SettingsViewModel.ServerStatus.Reachable -> "✅ Erreichbar"
+                        is SettingsViewModel.ServerStatus.Reachable -> stringResource(R.string.settings_server_status_reachable)
-                        is SettingsViewModel.ServerStatus.Unreachable -> "❌ Nicht erreichbar"
+                        is SettingsViewModel.ServerStatus.Unreachable -> stringResource(R.string.settings_server_status_unreachable)
-                        is SettingsViewModel.ServerStatus.Checking -> "🔍 Prüfe..."
+                        is SettingsViewModel.ServerStatus.Checking -> stringResource(R.string.settings_server_status_checking)
-                        is SettingsViewModel.ServerStatus.NotConfigured -> "⚠️ Nicht konfiguriert"
+                        is SettingsViewModel.ServerStatus.NotConfigured -> stringResource(R.string.settings_server_status_not_configured)
                         else -> null
                     },
                     statusColor = when (serverStatus) {
@@ -87,14 +111,14 @@ fun SettingsMainScreen(
             // Sync-Einstellungen
             item {
                 val intervalText = when (syncInterval) {
-                    15L -> "15 Min"
+                    15L -> stringResource(R.string.settings_interval_15min)
-                    60L -> "60 Min"
+                    60L -> stringResource(R.string.settings_interval_60min)
-                    else -> "30 Min"
+                    else -> stringResource(R.string.settings_interval_30min)
                 }
                 SettingsCard(
                     icon = Icons.Default.Sync,
-                    title = "Sync-Einstellungen",
+                    title = stringResource(R.string.settings_sync),
-                    subtitle = if (autoSyncEnabled) "Auto-Sync: An • $intervalText" else "Auto-Sync: Aus",
+                    subtitle = if (autoSyncEnabled) stringResource(R.string.settings_sync_auto_on, intervalText) else stringResource(R.string.settings_sync_auto_off),
                     onClick = { onNavigate(SettingsRoute.Sync) }
                 )
             }
@@ -103,8 +127,8 @@ fun SettingsMainScreen(
             item {
                 SettingsCard(
                     icon = Icons.Default.Description,
-                    title = "Markdown Desktop-Integration",
+                    title = stringResource(R.string.settings_markdown),
-                    subtitle = if (markdownAutoSync) "Auto-Sync: An" else "Auto-Sync: Aus",
+                    subtitle = if (markdownAutoSync) stringResource(R.string.settings_markdown_auto_on) else stringResource(R.string.settings_markdown_auto_off),
                     onClick = { onNavigate(SettingsRoute.Markdown) }
                 )
             }
@@ -113,8 +137,8 @@ fun SettingsMainScreen(
             item {
                 SettingsCard(
                     icon = Icons.Default.Backup,
-                    title = "Backup & Wiederherstellung",
+                    title = stringResource(R.string.settings_backup),
-                    subtitle = "Lokales oder Server-Backup",
+                    subtitle = stringResource(R.string.settings_backup_subtitle),
                     onClick = { onNavigate(SettingsRoute.Backup) }
                 )
             }
@@ -123,8 +147,8 @@ fun SettingsMainScreen(
             item {
                 SettingsCard(
                     icon = Icons.Default.Info,
-                    title = "Über diese App",
+                    title = stringResource(R.string.settings_about),
-                    subtitle = "Version ${BuildConfig.VERSION_NAME}",
+                    subtitle = stringResource(R.string.about_version, BuildConfig.VERSION_NAME, BuildConfig.VERSION_CODE),
                     onClick = { onNavigate(SettingsRoute.About) }
                 )
             }
@@ -133,8 +157,8 @@ fun SettingsMainScreen(
             item {
                 SettingsCard(
                     icon = Icons.Default.BugReport,
-                    title = "Debug & Diagnose",
+                    title = stringResource(R.string.settings_debug),
-                    subtitle = if (fileLoggingEnabled) "Logging: An" else "Logging: Aus",
+                    subtitle = if (fileLoggingEnabled) stringResource(R.string.settings_debug_logging_on) else stringResource(R.string.settings_debug_logging_off),
                     onClick = { onNavigate(SettingsRoute.Debug) }
                 )
             }

android/app/src/main/java/dev/dettmer/simplenotes/ui/settings/screens/SyncSettingsScreen.kt

@@ -13,7 +13,9 @@ import androidx.compose.runtime.Composable
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.dp
+import dev.dettmer.simplenotes.R
 import dev.dettmer.simplenotes.ui.settings.SettingsViewModel
 import dev.dettmer.simplenotes.ui.settings.components.RadioOption
 import dev.dettmer.simplenotes.ui.settings.components.SettingsDivider
@@ -36,7 +38,7 @@ fun SyncSettingsScreen(
     val syncInterval by viewModel.syncInterval.collectAsState()
     
     SettingsScaffold(
-        title = "Sync-Einstellungen",
+        title = stringResource(R.string.sync_settings_title),
         onBack = onBack
     ) { paddingValues ->
         Column(
@@ -49,18 +51,14 @@ fun SyncSettingsScreen(
             
             // Auto-Sync Info
             SettingsInfoCard(
-                text = "🔄 Auto-Sync:\n" +
+                text = stringResource(R.string.sync_auto_sync_info)
-                    "• Prüft alle 30 Min. ob Server erreichbar\n" +
-                    "• Funktioniert bei jeder WiFi-Verbindung\n" +
-                    "• Läuft auch im Hintergrund\n" +
-                    "• Minimaler Akkuverbrauch (~0.4%/Tag)"
             )
             
             Spacer(modifier = Modifier.height(8.dp))
             
             // Auto-Sync Toggle
             SettingsSwitch(
-                title = "Auto-Sync aktiviert",
+                title = stringResource(R.string.sync_auto_sync_enabled),
                 checked = autoSyncEnabled,
                 onCheckedChange = { viewModel.setAutoSync(it) },
                 icon = Icons.Default.Sync
@@ -69,14 +67,10 @@ fun SyncSettingsScreen(
             SettingsDivider()
             
             // Sync Interval Section
-            SettingsSectionHeader(text = "Sync-Intervall")
+            SettingsSectionHeader(text = stringResource(R.string.sync_interval_section))
             
             SettingsInfoCard(
-                text = "Legt fest, wie oft die App im Hintergrund synchronisiert. " +
+                text = stringResource(R.string.sync_interval_info)
-                    "Kürzere Intervalle bedeuten aktuellere Daten, verbrauchen aber etwas mehr Akku.\n\n" +
-                    "⏱️ Hinweis: Wenn dein Smartphone im Standby ist, kann Android die " +
-                    "Synchronisation verzögern (bis zu 60 Min.), um Akku zu sparen. " +
-                    "Das ist normal und betrifft alle Hintergrund-Apps."
             )
             
             Spacer(modifier = Modifier.height(8.dp))
@@ -85,18 +79,18 @@ fun SyncSettingsScreen(
             val intervalOptions = listOf(
                 RadioOption(
                     value = 15L,
-                    title = "⚡ Alle 15 Minuten",
+                    title = stringResource(R.string.sync_interval_15min_title),
-                    subtitle = "Schnellste Synchronisation • ~0.8% Akku/Tag (~23 mAh)"
+                    subtitle = stringResource(R.string.sync_interval_15min_subtitle)
                 ),
                 RadioOption(
                     value = 30L,
-                    title = "✓ Alle 30 Minuten (Empfohlen)",
+                    title = stringResource(R.string.sync_interval_30min_title),
-                    subtitle = "Ausgewogenes Verhältnis • ~0.4% Akku/Tag (~12 mAh)"
+                    subtitle = stringResource(R.string.sync_interval_30min_subtitle)
                 ),
                 RadioOption(
                     value = 60L,
-                    title = "🔋 Alle 60 Minuten",
+                    title = stringResource(R.string.sync_interval_60min_title),
-                    subtitle = "Maximale Akkulaufzeit • ~0.2% Akku/Tag (~6 mAh geschätzt)"
+                    subtitle = stringResource(R.string.sync_interval_60min_subtitle)
                 )
             )
             

android/app/src/main/java/dev/dettmer/simplenotes/utils/Extensions.kt

@@ -2,6 +2,7 @@ package dev.dettmer.simplenotes.utils
 
 import android.content.Context
 import android.widget.Toast
+import dev.dettmer.simplenotes.R
 import java.text.SimpleDateFormat
 import java.util.Date
 import java.util.Locale
@@ -15,7 +16,7 @@ fun Context.showToast(message: String, duration: Int = Toast.LENGTH_SHORT) {
     Toast.makeText(this, message, duration).show()
 }
 
-// Timestamp to readable format
+// Timestamp to readable format (legacy - without context, uses German)
 fun Long.toReadableTime(): String {
     val now = System.currentTimeMillis()
     val diff = now - this
@@ -41,6 +42,32 @@ fun Long.toReadableTime(): String {
     }
 }
 
+// Timestamp to readable format (with context for i18n)
+fun Long.toReadableTime(context: Context): String {
+    val now = System.currentTimeMillis()
+    val diff = now - this
+    
+    return when {
+        diff < TimeUnit.MINUTES.toMillis(1) -> context.getString(R.string.time_just_now)
+        diff < TimeUnit.HOURS.toMillis(1) -> {
+            val minutes = TimeUnit.MILLISECONDS.toMinutes(diff).toInt()
+            context.getString(R.string.time_minutes_ago, minutes)
+        }
+        diff < TimeUnit.DAYS.toMillis(1) -> {
+            val hours = TimeUnit.MILLISECONDS.toHours(diff).toInt()
+            context.getString(R.string.time_hours_ago, hours)
+        }
+        diff < TimeUnit.DAYS.toMillis(DAYS_THRESHOLD) -> {
+            val days = TimeUnit.MILLISECONDS.toDays(diff).toInt()
+            context.getString(R.string.time_days_ago, days)
+        }
+        else -> {
+            val sdf = SimpleDateFormat("dd.MM.yyyy", Locale.getDefault())
+            sdf.format(Date(this))
+        }
+    }
+}
+
 // Truncate long strings
 fun String.truncate(maxLength: Int): String {
     return if (length > maxLength) {

android/app/src/main/java/dev/dettmer/simplenotes/utils/NotificationHelper.kt

@@ -2,6 +2,7 @@ package dev.dettmer.simplenotes.utils
 
 import android.app.NotificationChannel
 import android.app.NotificationManager
+import dev.dettmer.simplenotes.R
 import android.app.PendingIntent
 import android.content.Context
 import android.content.Intent
@@ -16,8 +17,6 @@ object NotificationHelper {
     
     private const val TAG = "NotificationHelper"
     private const val CHANNEL_ID = "notes_sync_channel"
-    private const val CHANNEL_NAME = "Notizen Synchronisierung"
-    private const val CHANNEL_DESCRIPTION = "Benachrichtigungen über Sync-Status"
     private const val NOTIFICATION_ID = 1001
     private const val SYNC_NOTIFICATION_ID = 2
     private const val AUTO_CANCEL_TIMEOUT_MS = 30_000L
@@ -29,9 +28,11 @@ object NotificationHelper {
     fun createNotificationChannel(context: Context) {
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
             val importance = NotificationManager.IMPORTANCE_DEFAULT
+            val channelName = context.getString(R.string.notification_channel_name)
+            val channelDescription = context.getString(R.string.notification_channel_desc)
             
-            val channel = NotificationChannel(CHANNEL_ID, CHANNEL_NAME, importance).apply {
+            val channel = NotificationChannel(CHANNEL_ID, channelName, importance).apply {
-                description = CHANNEL_DESCRIPTION
+                description = channelDescription
                 enableVibration(true)
                 enableLights(true)
             }
@@ -68,8 +69,8 @@ object NotificationHelper {
         
         val notification = NotificationCompat.Builder(context, CHANNEL_ID)
             .setSmallIcon(android.R.drawable.ic_menu_upload)
-            .setContentTitle("Sync erfolgreich")
+            .setContentTitle(context.getString(R.string.notification_sync_success_title))
-            .setContentText("$syncedCount Notiz(en) synchronisiert")
+            .setContentText(context.getString(R.string.notification_sync_success_message, syncedCount))
             .setPriority(NotificationCompat.PRIORITY_DEFAULT)
             .setContentIntent(pendingIntent)
             .setAutoCancel(true)
@@ -96,7 +97,7 @@ object NotificationHelper {
     fun showSyncFailureNotification(context: Context, errorMessage: String) {
         val notification = NotificationCompat.Builder(context, CHANNEL_ID)
             .setSmallIcon(android.R.drawable.ic_dialog_alert)
-            .setContentTitle("Sync fehlgeschlagen")
+            .setContentTitle(context.getString(R.string.notification_sync_failed_title))
             .setContentText(errorMessage)
             .setStyle(NotificationCompat.BigTextStyle()
                 .bigText(errorMessage))
@@ -125,8 +126,8 @@ object NotificationHelper {
     fun showSyncProgressNotification(context: Context): Int {
         val notification = NotificationCompat.Builder(context, CHANNEL_ID)
             .setSmallIcon(android.R.drawable.ic_popup_sync)
-            .setContentTitle("Synchronisiere...")
+            .setContentTitle(context.getString(R.string.notification_sync_progress_title))
-            .setContentText("Notizen werden synchronisiert")
+            .setContentText(context.getString(R.string.notification_sync_progress_message))
             .setPriority(NotificationCompat.PRIORITY_LOW)
             .setOngoing(true)
             .setProgress(0, 0, true)
@@ -161,8 +162,8 @@ object NotificationHelper {
         
         val notification = NotificationCompat.Builder(context, CHANNEL_ID)
             .setSmallIcon(android.R.drawable.ic_dialog_info)
-            .setContentTitle("Sync-Konflikt erkannt")
+            .setContentTitle(context.getString(R.string.notification_sync_conflict_title))
-            .setContentText("$conflictCount Notiz(en) haben Konflikte")
+            .setContentText(context.getString(R.string.notification_sync_conflict_message, conflictCount))
             .setPriority(NotificationCompat.PRIORITY_HIGH)
             .setContentIntent(pendingIntent)
             .setAutoCancel(true)
@@ -212,8 +213,8 @@ object NotificationHelper {
     fun showSyncInProgress(context: Context) {
         val notification = NotificationCompat.Builder(context, CHANNEL_ID)
             .setSmallIcon(android.R.drawable.stat_notify_sync)
-            .setContentTitle("Synchronisierung läuft")
+            .setContentTitle(context.getString(R.string.notification_sync_in_progress_title))
-            .setContentText("Notizen werden synchronisiert...")
+            .setContentText(context.getString(R.string.notification_sync_in_progress_message))
             .setPriority(NotificationCompat.PRIORITY_LOW)
             .setOngoing(true)
             .build()
@@ -240,8 +241,8 @@ object NotificationHelper {
         
         val notification = NotificationCompat.Builder(context, CHANNEL_ID)
             .setSmallIcon(android.R.drawable.stat_notify_sync)
-            .setContentTitle("Sync erfolgreich")
+            .setContentTitle(context.getString(R.string.notification_sync_success_title))
-            .setContentText("$count Notizen synchronisiert")
+            .setContentText(context.getString(R.string.notification_sync_success_message, count))
             .setPriority(NotificationCompat.PRIORITY_DEFAULT)
             .setCategory(NotificationCompat.CATEGORY_STATUS)
             .setContentIntent(pendingIntent)  // Click öffnet App
@@ -271,7 +272,7 @@ object NotificationHelper {
         
         val notification = NotificationCompat.Builder(context, CHANNEL_ID)
             .setSmallIcon(android.R.drawable.stat_notify_error)
-            .setContentTitle("Sync Fehler")
+            .setContentTitle(context.getString(R.string.notification_sync_error_title))
             .setContentText(message)
             .setPriority(NotificationCompat.PRIORITY_DEFAULT)
             .setCategory(NotificationCompat.CATEGORY_ERROR)
@@ -308,11 +309,10 @@ object NotificationHelper {
         
         val notification = NotificationCompat.Builder(context, CHANNEL_ID)
             .setSmallIcon(android.R.drawable.stat_notify_error)
-            .setContentTitle("⚠️ Sync-Warnung")
+            .setContentTitle(context.getString(R.string.notification_sync_warning_title))
-            .setContentText("Server seit ${hoursSinceLastSync}h nicht erreichbar")
+            .setContentText(context.getString(R.string.notification_sync_warning_message, hoursSinceLastSync.toInt()))
             .setStyle(NotificationCompat.BigTextStyle()
-                .bigText("Der WebDAV-Server ist seit ${hoursSinceLastSync} Stunden nicht erreichbar. " +
+                .bigText(context.getString(R.string.notification_sync_warning_detail, hoursSinceLastSync.toInt())))
-                        "Bitte prüfe deine Netzwerkverbindung oder Server-Einstellungen."))
             .setPriority(NotificationCompat.PRIORITY_DEFAULT)
             .setCategory(NotificationCompat.CATEGORY_STATUS)
             .setContentIntent(pendingIntent)

android/app/src/main/java/dev/dettmer/simplenotes/utils/UrlValidator.kt

@@ -1,5 +1,7 @@
 package dev.dettmer.simplenotes.utils
 
+import android.content.Context
+import dev.dettmer.simplenotes.R
 import java.net.URL
 
 /**
@@ -91,7 +93,7 @@ object UrlValidator {
      * Validiert ob HTTP URL erlaubt ist
      * @return Pair<Boolean, String?> - (isValid, errorMessage)
      */
-    fun validateHttpUrl(url: String): Pair<Boolean, String?> {
+    fun validateHttpUrl(context: Context, url: String): Pair<Boolean, String?> {
         return try {
             val parsedUrl = URL(url)
             
@@ -107,16 +109,15 @@ object UrlValidator {
                 } else {
                     return Pair(
                         false,
-                        "HTTP ist nur für lokale Server erlaubt (z.B. 192.168.x.x, 10.x.x.x, nas.local). " +
+                        context.getString(R.string.error_http_local_only)
-                        "Für öffentliche Server verwende bitte HTTPS."
                     )
                 }
             }
             
             // Anderes Protokoll
-            Pair(false, "Ungültiges Protokoll: ${parsedUrl.protocol}. Bitte verwende HTTP oder HTTPS.")
+            Pair(false, context.getString(R.string.error_invalid_protocol, parsedUrl.protocol))
         } catch (e: Exception) {
-            Pair(false, "Ungültige URL: ${e.message}")
+            Pair(false, context.getString(R.string.error_invalid_url, e.message ?: ""))
         }
     }
 }

android/app/src/main/res/values-de/strings.xml

@@ -0,0 +1,393 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- ============================= -->
+    <!-- APP IDENTITY                  -->
+    <!-- ============================= -->
+    <string name="app_name">Simple Notes</string>
+    
+    <!-- ============================= -->
+    <!-- MAIN SCREEN                   -->
+    <!-- ============================= -->
+    <string name="main_title">Simple Notes</string>
+    <string name="no_notes_yet">Noch keine Notizen.\nTippe + um eine zu erstellen.</string>
+    <string name="add_note">Notiz hinzufügen</string>
+    <string name="sync">Synchronisieren</string>
+    <string name="settings">Einstellungen</string>
+    <string name="action_sync">Synchronisieren</string>
+    <string name="action_settings">Einstellungen</string>
+    <string name="action_close_selection">Auswahl beenden</string>
+    <string name="action_select_all">Alle auswählen</string>
+    <string name="action_delete_selected">Ausgewählte löschen</string>
+    <string name="selection_count">%d ausgewählt</string>
+    
+    <!-- ============================= -->
+    <!-- EMPTY STATE                   -->
+    <!-- ============================= -->
+    <string name="empty_state_title">Noch keine Notizen</string>
+    <string name="empty_state_message">Tippe + um eine neue Notiz zu erstellen</string>
+    
+    <!-- ============================= -->
+    <!-- FAB MENU                      -->
+    <!-- ============================= -->
+    <string name="fab_new_note">Neue Notiz</string>
+    <string name="fab_text_note">Text-Notiz</string>
+    <string name="fab_checklist">Checkliste</string>
+    <string name="create_text_note">Notiz</string>
+    <string name="create_checklist">Liste</string>
+    
+    <!-- ============================= -->
+    <!-- NOTE CARD                     -->
+    <!-- ============================= -->
+    <string name="note_title_placeholder">Notiz-Titel</string>
+    <string name="note_content_placeholder">Notiz-Vorschau…</string>
+    <string name="note_timestamp_placeholder">Vor 2 Std</string>
+    <string name="untitled">Ohne Titel</string>
+    <string name="checklist_progress">%1$d/%2$d erledigt</string>
+    <string name="empty_checklist">Keine Einträge</string>
+    
+    <!-- ============================= -->
+    <!-- SYNC STATUS BANNER            -->
+    <!-- ============================= -->
+    <string name="sync_status">Sync-Status</string>
+    <string name="sync_syncing">Synchronisiere…</string>
+    <string name="sync_completed">Synchronisiert</string>
+    <string name="sync_error">Fehler</string>
+    <string name="sync_status_syncing">Synchronisiere…</string>
+    <string name="sync_status_completed">Synchronisierung abgeschlossen</string>
+    <string name="sync_status_error">Synchronisierung fehlgeschlagen</string>
+    <string name="sync_already_running">Synchronisierung läuft bereits</string>
+    
+    <!-- ============================= -->
+    <!-- DELETE DIALOGS                -->
+    <!-- ============================= -->
+    <string name="delete_note_title">Notiz löschen?</string>
+    <string name="delete_notes_title">%d Notizen löschen?</string>
+    <string name="delete_note_message">Wie möchtest du diese Notiz löschen?</string>
+    <string name="delete_notes_message">Wie möchtest du diese %d Notizen löschen?</string>
+    <string name="delete_everywhere">Überall löschen (auch Server)</string>
+    <string name="delete_local_only">Nur lokal löschen</string>
+    <string name="delete">Löschen</string>
+    <string name="cancel">Abbrechen</string>
+    <string name="ok">OK</string>
+    <!-- Legacy delete dialogs -->
+    <string name="legacy_delete_dialog_title">Notiz löschen</string>
+    <string name="legacy_delete_dialog_message">\"%s\" wird lokal gelöscht.\n\nAuch vom Server löschen?</string>
+    <string name="legacy_delete_from_server">Vom Server löschen</string>
+    <string name="legacy_delete_with_server">\"%s\" wird lokal und vom Server gelöscht</string>
+    <string name="legacy_delete_local_only">\"%s\" lokal gelöscht (Server bleibt)</string>
+    
+    <!-- ============================= -->
+    <!-- SNACKBAR MESSAGES             -->
+    <!-- ============================= -->
+    <string name="snackbar_undo">RÜCKGÄNGIG</string>
+    <string name="snackbar_note_deleted_local">\"%s\" lokal gelöscht</string>
+    <string name="snackbar_note_deleted_server">\"%s\" wird vom Server gelöscht</string>
+    <string name="snackbar_notes_deleted_local">%d Notiz(en) lokal gelöscht</string>
+    <string name="snackbar_notes_deleted_server">%d Notiz(en) werden vom Server gelöscht</string>
+    <string name="snackbar_deleted_from_server">Vom Server gelöscht</string>
+    <string name="snackbar_server_delete_failed">Server-Löschung fehlgeschlagen</string>
+    <string name="snackbar_server_error">Server-Fehler: %s</string>
+    <string name="snackbar_already_synced">Bereits synchronisiert</string>
+    <string name="snackbar_server_unreachable">Server nicht erreichbar</string>
+    <string name="snackbar_synced_count">✅ Gesynct: %d Notizen</string>
+    
+    <!-- ============================= -->
+    <!-- URL VALIDATION ERRORS         -->
+    <!-- ============================= -->
+    <string name="error_http_local_only">HTTP ist nur für lokale Server erlaubt (z.B. 192.168.x.x, 10.x.x.x, nas.local). Für öffentliche Server verwende bitte HTTPS.</string>
+    <string name="error_invalid_protocol">Ungültiges Protokoll: %s. Bitte verwende HTTP oder HTTPS.</string>
+    <string name="error_invalid_url">Ungültige URL: %s</string>
+    <string name="error_server_not_configured">WebDAV-Server nicht vollständig konfiguriert</string>
+    <string name="error_sardine_client_failed">Sardine Client konnte nicht erstellt werden</string>
+    <string name="error_server_url_not_configured">Server-URL nicht konfiguriert</string>
+    
+    <!-- ============================= -->
+    <!-- NOTE EDITOR                   -->
+    <!-- ============================= -->
+    <string name="new_note">Neue Notiz</string>
+    <string name="edit_note">Notiz bearbeiten</string>
+    <string name="new_checklist">Neue Liste</string>
+    <string name="edit_checklist">Liste bearbeiten</string>
+    <string name="title">Titel</string>
+    <string name="content">Inhalt</string>
+    <string name="back">Zurück</string>
+    <string name="save">Speichern</string>
+    <string name="add_item">Element hinzufügen</string>
+    <string name="item_placeholder">Neues Element…</string>
+    <string name="reorder_item">Element verschieben</string>
+    <string name="drag_to_reorder">Ziehen zum Sortieren</string>
+    <string name="delete_item">Element löschen</string>
+    <string name="note_is_empty">Notiz ist leer</string>
+    <string name="note_saved">Notiz gespeichert</string>
+    <string name="note_deleted">Notiz gelöscht</string>
+    
+    <!-- ============================= -->
+    <!-- SETTINGS - MAIN               -->
+    <!-- ============================= -->
+    <string name="settings_title">Einstellungen</string>
+    <string name="settings_language">Sprache</string>
+    <string name="settings_language_subtitle">%s</string>
+    <string name="settings_server">Server-Einstellungen</string>
+    <string name="settings_server_status_reachable">✅ Erreichbar</string>
+    <string name="settings_server_status_unreachable">❌ Nicht erreichbar</string>
+    <string name="settings_server_status_checking">🔍 Prüfe…</string>
+    <string name="settings_server_status_not_configured">⚠️ Nicht konfiguriert</string>
+    <string name="settings_sync">Sync-Einstellungen</string>
+    <string name="settings_sync_auto_on">Auto-Sync: An • %s</string>
+    <string name="settings_sync_auto_off">Auto-Sync: Aus</string>
+    <string name="settings_interval_15min">15 Min</string>
+    <string name="settings_interval_30min">30 Min</string>
+    <string name="settings_interval_60min">60 Min</string>
+    <string name="settings_markdown">Markdown Desktop-Integration</string>
+    <string name="settings_markdown_auto_on">Auto-Sync: An</string>
+    <string name="settings_markdown_auto_off">Auto-Sync: Aus</string>
+    <string name="settings_backup">Backup &amp; Wiederherstellung</string>
+    <string name="settings_backup_subtitle">Lokales oder Server-Backup</string>
+    <string name="settings_about">Über diese App</string>
+    <string name="settings_debug">Debug &amp; Diagnose</string>
+    <string name="settings_debug_logging_on">Logging: An</string>
+    <string name="settings_debug_logging_off">Logging: Aus</string>
+    
+    <!-- ============================= -->
+    <!-- SETTINGS - SERVER             -->
+    <!-- ============================= -->
+    <string name="server_settings">Server-Einstellungen</string>
+    <string name="server_settings_title">Server-Einstellungen</string>
+    <string name="server_connection_type">Verbindungstyp</string>
+    <string name="server_connection_http">🏠 Intern (HTTP)</string>
+    <string name="server_connection_https">🌐 Extern (HTTPS)</string>
+    <string name="server_connection_http_hint">HTTP nur für lokale Netzwerke (z.B. 192.168.x.x, 10.x.x.x)</string>
+    <string name="server_connection_https_hint">HTTPS für sichere Verbindungen über das Internet</string>
+    <string name="server_address">Server-Adresse</string>
+    <string name="server_address_hint">z.B. http://192.168.0.188:8080/notes</string>
+    <string name="server_url">Server URL</string>
+    <string name="username">Benutzername</string>
+    <string name="password">Passwort</string>
+    <string name="server_password_show">Anzeigen</string>
+    <string name="server_password_hide">Verstecken</string>
+    <string name="server_status_label">Server-Status:</string>
+    <string name="server_status_reachable">✅ Erreichbar</string>
+    <string name="server_status_unreachable">❌ Nicht erreichbar</string>
+    <string name="server_status_checking">🔍 Prüfe…</string>
+    <string name="server_status_not_configured">⚠️ Nicht konfiguriert</string>
+    <string name="server_status_unknown">❓ Unbekannt</string>
+    <string name="test_connection">Verbindung testen</string>
+    <string name="sync_now">Jetzt synchronisieren</string>
+    
+    <!-- ============================= -->
+    <!-- SETTINGS - SYNC               -->
+    <!-- ============================= -->
+    <string name="sync_settings">Sync-Einstellungen</string>
+    <string name="sync_settings_title">Sync-Einstellungen</string>
+    <string name="auto_sync">Auto-Sync aktiviert</string>
+    <string name="sync_auto_sync_info">🔄 Auto-Sync:\n• Prüft alle 30 Min. ob Server erreichbar\n• Funktioniert bei jeder WiFi-Verbindung\n• Läuft auch im Hintergrund\n• Minimaler Akkuverbrauch (~0.4%/Tag)</string>
+    <string name="sync_auto_sync_enabled">Auto-Sync aktiviert</string>
+    <string name="sync_interval_section">Sync-Intervall</string>
+    <string name="sync_interval_info">Legt fest, wie oft die App im Hintergrund synchronisiert. Kürzere Intervalle bedeuten aktuellere Daten, verbrauchen aber etwas mehr Akku.\n\n⏱️ Hinweis: Wenn dein Smartphone im Standby ist, kann Android die Synchronisation verzögern (bis zu 60 Min.), um Akku zu sparen. Das ist normal und betrifft alle Hintergrund-Apps.</string>
+    <string name="sync_interval_15min_title">⚡ Alle 15 Minuten</string>
+    <string name="sync_interval_15min_subtitle">Schnellste Synchronisation • ~0.8% Akku/Tag (~23 mAh)</string>
+    <string name="sync_interval_30min_title">✓ Alle 30 Minuten (Empfohlen)</string>
+    <string name="sync_interval_30min_subtitle">Ausgewogenes Verhältnis • ~0.4% Akku/Tag (~12 mAh)</string>
+    <string name="sync_interval_60min_title">🔋 Alle 60 Minuten</string>
+    <string name="sync_interval_60min_subtitle">Maximale Akkulaufzeit • ~0.2% Akku/Tag (~6 mAh geschätzt)</string>
+    <!-- Legacy -->
+    <string name="auto_sync_info">ℹ️ Auto-Sync:\n\n• Prüft alle 30 Min ob Server erreichbar\n• Funktioniert bei jeder WiFi-Verbindung\n• Läuft auch im Hintergrund\n• Minimaler Akkuverbrauch (~0.4%%/Tag)</string>
+    
+    <!-- ============================= -->
+    <!-- SETTINGS - MARKDOWN           -->
+    <!-- ============================= -->
+    <string name="markdown_settings_title">Markdown Desktop-Integration</string>
+    <string name="markdown_dialog_title">Markdown Auto-Sync</string>
+    <string name="markdown_export_complete">✅ Export abgeschlossen</string>
+    <string name="markdown_export_progress">Exportiere %1$d/%2$d Notizen…</string>
+    <string name="markdown_info">📝 Exportiert Notizen zusätzlich als .md-Dateien. Mounte WebDAV als Netzlaufwerk um mit VS Code, Typora oder jedem Markdown-Editor zu bearbeiten. JSON-Sync bleibt primäres Format.</string>
+    <string name="markdown_auto_sync_title">Markdown Auto-Sync</string>
+    <string name="markdown_auto_sync_subtitle">Synchronisiert Notizen automatisch als .md-Dateien (Upload + Download bei jedem Sync)</string>
+    <string name="markdown_manual_sync_info">Manueller Sync exportiert alle Notizen als .md-Dateien und importiert .md-Dateien vom Server. Nützlich für einmalige Synchronisation.</string>
+    <string name="markdown_manual_sync_button">📝 Manueller Markdown-Sync</string>
+    
+    <!-- ============================= -->
+    <!-- SETTINGS - BACKUP             -->
+    <!-- ============================= -->
+    <string name="backup_settings_title">Backup &amp; Wiederherstellung</string>
+    <string name="backup_restore_title">Backup &amp; Wiederherstellung</string>
+    <string name="backup_auto_info">📦 Bei jeder Wiederherstellung wird automatisch ein Sicherheits-Backup erstellt.</string>
+    <string name="backup_local_section">Lokales Backup</string>
+    <string name="backup_create">💾 Backup erstellen</string>
+    <string name="backup_restore_file">📂 Aus Datei wiederherstellen</string>
+    <string name="backup_server_section">Server-Backup</string>
+    <string name="backup_restore_server">☁️ Vom Server wiederherstellen</string>
+    <string name="backup_restore_dialog_title">⚠️ Backup wiederherstellen?</string>
+    <string name="backup_restore_source">Quelle: %s</string>
+    <string name="backup_restore_source_file">Lokale Datei</string>
+    <string name="backup_restore_source_server">WebDAV Server</string>
+    <string name="backup_restore_mode_label">Wiederherstellungs-Modus:</string>
+    <string name="backup_mode_merge_title">⚪ Zusammenführen (Standard)</string>
+    <string name="backup_mode_merge_subtitle">Neue hinzufügen, Bestehende behalten</string>
+    <string name="backup_mode_merge_full">⚪ Zusammenführen (Standard)\n   → Neue hinzufügen, Bestehende behalten</string>
+    <string name="backup_mode_replace_title">⚪ Ersetzen</string>
+    <string name="backup_mode_replace_subtitle">Alle löschen &amp; Backup importieren</string>
+    <string name="backup_mode_replace_full">⚪ Ersetzen\n   → Alle löschen &amp; Backup importieren</string>
+    <string name="backup_mode_overwrite_title">⚪ Duplikate überschreiben</string>
+    <string name="backup_mode_overwrite_subtitle">Backup gewinnt bei Konflikten</string>
+    <string name="backup_mode_overwrite_full">⚪ Duplikate überschreiben\n   → Backup gewinnt bei Konflikten</string>
+    <string name="backup_restore_info">ℹ️ Ein Sicherheits-Backup wird vor dem Wiederherstellen automatisch erstellt.</string>
+    <string name="backup_restore_button">Wiederherstellen</string>
+    <!-- Legacy -->
+    <string name="backup_restore_warning">⚠️ Achtung:\n\nDie Wiederherstellung überschreibt ALLE lokalen Notizen mit den Daten vom Server. Diese Aktion kann nicht rückgängig gemacht werden!</string>
+    <string name="restore_from_server">Vom Server wiederherstellen</string>
+    <string name="restore_confirmation_title">⚠️ Vom Server wiederherstellen?</string>
+    <string name="restore_confirmation_message">WARNUNG: Alle lokalen Notizen werden gelöscht und durch die Notizen vom Server ersetzt.\n\nDieser Vorgang kann nicht rückgängig gemacht werden!</string>
+    <string name="restore_button">Wiederherstellen</string>
+    <string name="restore_progress">Stelle Notizen wieder her…</string>
+    <string name="restore_success">✓ %d Notizen wiederhergestellt</string>
+    <string name="restore_error">Fehler: %s</string>
+    
+    <!-- ============================= -->
+    <!-- SETTINGS - DEBUG              -->
+    <!-- ============================= -->
+    <string name="debug_settings_title">Debug &amp; Diagnose</string>
+    <string name="debug_file_logging_title">Datei-Logging</string>
+    <string name="debug_file_logging_subtitle">Sync-Logs in Datei speichern</string>
+    <string name="debug_privacy_info">🔒 Datenschutz: Logs werden nur lokal auf deinem Gerät gespeichert und niemals an externe Server gesendet. Die Logs enthalten Sync-Aktivitäten zur Fehlerdiagnose. Du kannst sie jederzeit löschen oder exportieren.</string>
+    <string name="debug_log_actions_section">Log-Aktionen</string>
+    <string name="debug_export_logs">📤 Logs exportieren &amp; teilen</string>
+    <string name="debug_logs_subject">SimpleNotes Sync Logs</string>
+    <string name="debug_logs_share_via">Logs teilen via…</string>
+    <string name="debug_delete_logs">🗑️ Logs löschen</string>
+    <string name="debug_delete_logs_title">Logs löschen?</string>
+    <string name="debug_delete_logs_message">Alle gespeicherten Sync-Logs werden unwiderruflich gelöscht.</string>
+    <!-- Legacy -->
+    <string name="file_logging_privacy_notice">ℹ️ Datenschutz: Logs werden nur lokal auf deinem Gerät gespeichert und niemals an externe Server gesendet. Die Logs enthalten Sync-Aktivitäten zur Fehlerdiagnose. Du kannst sie jederzeit löschen oder exportieren.</string>
+    
+    <!-- ============================= -->
+    <!-- SETTINGS - LANGUAGE           -->
+    <!-- ============================= -->
+    <string name="language_settings_title">Sprache</string>
+    <string name="language_system_default">Systemstandard</string>
+    <string name="language_english">English</string>
+    <string name="language_german">Deutsch</string>
+    <string name="language_info">ℹ️ Wähle deine bevorzugte Sprache. Die App wird neu gestartet, um die Änderung anzuwenden.</string>
+    <string name="language_changed_restart">Sprache geändert. Neustart…</string>
+    
+    <!-- ============================= -->
+    <!-- SETTINGS - ABOUT              -->
+    <!-- ============================= -->
+    <string name="about_settings_title">Über diese App</string>
+    <string name="about_app_name">Simple Notes Sync</string>
+    <string name="about_version">Version %1$s (%2$d)</string>
+    <string name="about_links_section">Links</string>
+    <string name="about_github_title">GitHub Repository</string>
+    <string name="about_github_subtitle">Quellcode, Issues &amp; Dokumentation</string>
+    <string name="about_developer_title">Entwickler</string>
+    <string name="about_developer_subtitle">GitHub Profil: @inventory69</string>
+    <string name="about_license_title">Lizenz</string>
+    <string name="about_license_subtitle">MIT License - Open Source</string>
+    <string name="about_privacy_title">🔒 Datenschutz</string>
+    <string name="about_privacy_text">Diese App sammelt keine Daten. Alle Notizen werden nur lokal auf deinem Gerät und auf deinem eigenen WebDAV-Server gespeichert. Keine Telemetrie, keine Werbung.</string>
+    
+    <!-- ============================= -->
+    <!-- TOAST MESSAGES                -->
+    <!-- ============================= -->
+    <string name="toast_connection_success">✅ Verbindung erfolgreich!</string>
+    <string name="toast_connection_failed">❌ %s</string>
+    <string name="toast_error">❌ Fehler: %s</string>
+    <string name="toast_syncing">🔄 Synchronisiere…</string>
+    <string name="toast_already_synced">✅ Bereits synchronisiert</string>
+    <string name="toast_sync_success">✅ %d Notizen synchronisiert</string>
+    <string name="toast_sync_failed">❌ %s</string>
+    <string name="toast_auto_sync_enabled">✅ Auto-Sync aktiviert</string>
+    <string name="toast_auto_sync_disabled">Auto-Sync deaktiviert</string>
+    <string name="toast_sync_interval">⏱️ Sync-Intervall: %s</string>
+    <string name="toast_sync_interval_15min">15 Minuten</string>
+    <string name="toast_sync_interval_30min">30 Minuten</string>
+    <string name="toast_sync_interval_60min">60 Minuten</string>
+    <string name="toast_configure_server_first">⚠️ Bitte zuerst WebDAV-Server konfigurieren</string>
+    <string name="toast_markdown_exported">✅ %d Notizen nach Markdown exportiert</string>
+    <string name="toast_markdown_enabled">📝 Markdown Auto-Sync aktiviert</string>
+    <string name="toast_markdown_disabled">📝 Markdown Auto-Sync deaktiviert</string>
+    <string name="toast_markdown_syncing">📝 Markdown-Sync läuft…</string>
+    <string name="toast_markdown_result">✅ Export: %1$d • Import: %2$d</string>
+    <string name="toast_export_failed">❌ Export fehlgeschlagen: %s</string>
+    <string name="toast_backup_success">✅ %s</string>
+    <string name="toast_backup_failed">❌ Backup fehlgeschlagen: %s</string>
+    <string name="toast_restore_success">✅ %d Notizen wiederhergestellt</string>
+    <string name="toast_restore_failed">❌ Wiederherstellung fehlgeschlagen: %s</string>
+    <string name="toast_notifications_enabled">Benachrichtigungen aktiviert</string>
+    <string name="toast_notifications_disabled">Benachrichtigungen deaktiviert. Du kannst sie in den Einstellungen aktivieren.</string>
+    <string name="toast_battery_optimization">Bitte Akku-Optimierung manuell deaktivieren</string>
+    <string name="toast_logs_deleted">🗑️ Logs gelöscht</string>
+    <string name="toast_no_logs_to_delete">📭 Keine Logs zum Löschen</string>
+    <string name="toast_logs_delete_error">❌ Fehler beim Löschen: %s</string>
+    <string name="toast_link_error">❌ Fehler beim Öffnen des Links</string>
+    <string name="toast_file_logging_enabled">📝 Datei-Logging aktiviert</string>
+    <string name="toast_file_logging_disabled">📝 Datei-Logging deaktiviert</string>
+    <string name="toast_sync_interval_changed">⏱️ Sync-Intervall auf %s geändert</string>
+    <string name="version_not_available">Version nicht verfügbar</string>
+    <string name="status_checking">🔍 Prüfe…</string>
+    <string name="battery_optimization_dialog_message">Bitte wähle \'Nicht optimieren\' für Simple Notes.</string>
+    <string name="battery_optimization_dialog_title">Hintergrund-Synchronisation</string>
+    <string name="battery_optimization_dialog_full_message">Damit die App im Hintergrund synchronisieren kann, muss die Akku-Optimierung deaktiviert werden.\n\nBitte wähle \'Nicht optimieren\' für Simple Notes.</string>
+    <string name="battery_optimization_open_settings">Einstellungen öffnen</string>
+    <string name="battery_optimization_later">Später</string>
+    <string name="content_description_back">Zurück</string>
+    <string name="error_invalid_backup_file">Ungültige Backup-Datei</string>
+    <string name="error_backup_version_unsupported">Backup-Version nicht unterstützt (v%1$d benötigt v%2$d+)</string>
+    <string name="error_backup_empty">Backup enthält keine Notizen</string>
+    <string name="error_backup_invalid_notes">Backup enthält %d ungültige Notizen</string>
+    <string name="error_backup_corrupt">Backup-Datei beschädigt oder ungültig: %s</string>
+    <string name="error_restore_failed">Wiederherstellung fehlgeschlagen: %s</string>
+    <string name="restore_merge_result">%1$d neue Notizen importiert, %2$d übersprungen</string>
+    <string name="restore_overwrite_result">%1$d neu, %2$d überschrieben</string>
+    <string name="restore_replace_result">Alle Notizen ersetzt: %d importiert</string>
+    
+    <!-- ============================= -->
+    <!-- RELATIVE TIME                 -->
+    <!-- ============================= -->
+    <string name="time_just_now">Gerade eben</string>
+    <string name="time_minutes_ago">Vor %d Min</string>
+    <string name="time_hours_ago">Vor %d Std</string>
+    <string name="time_days_ago">Vor %d Tagen</string>
+    
+    <!-- ============================= -->
+    <!-- NOTIFICATIONS                 -->
+    <!-- ============================= -->
+    <string name="notification_channel_name">Notizen Synchronisierung</string>
+    <string name="notification_channel_desc">Benachrichtigungen über Sync-Status</string>
+    <string name="notification_sync_success_title">Sync erfolgreich</string>
+    <string name="notification_sync_success_message">%d Notiz(en) synchronisiert</string>
+    <string name="notification_sync_failed_title">Sync fehlgeschlagen</string>
+    <string name="notification_sync_progress_title">Synchronisiere…</string>
+    <string name="notification_sync_progress_message">Notizen werden synchronisiert</string>
+    <string name="notification_sync_conflict_title">Sync-Konflikt erkannt</string>
+    <string name="notification_sync_conflict_message">%d Notiz(en) haben Konflikte</string>
+    <string name="notification_sync_warning_title">⚠️ Sync-Warnung</string>
+    <string name="notification_sync_warning_message">Server seit %dh nicht erreichbar</string>
+    <string name="notification_sync_warning_detail">Der WebDAV-Server ist seit %d Stunden nicht erreichbar. Bitte prüfe deine Netzwerkverbindung oder Server-Einstellungen.</string>
+    <string name="notification_sync_in_progress_title">Synchronisierung läuft</string>
+    <string name="notification_sync_in_progress_message">Notizen werden synchronisiert…</string>
+    <string name="notification_sync_error_title">Sync Fehler</string>
+    
+    <!-- ============================= -->
+    <!-- PLURALS                       -->
+    <!-- ============================= -->
+    <plurals name="notes_count">
+        <item quantity="one">%d Notiz</item>
+        <item quantity="other">%d Notizen</item>
+    </plurals>
+    
+    <plurals name="notes_deleted_local">
+        <item quantity="one">%d Notiz lokal gelöscht</item>
+        <item quantity="other">%d Notizen lokal gelöscht</item>
+    </plurals>
+    
+    <plurals name="notes_deleted_server">
+        <item quantity="one">%d Notiz wird vom Server gelöscht</item>
+        <item quantity="other">%d Notizen werden vom Server gelöscht</item>
+    </plurals>
+    
+    <plurals name="notes_synced">
+        <item quantity="one">%d Notiz synchronisiert</item>
+        <item quantity="other">%d Notizen synchronisiert</item>
+    </plurals>
+</resources>

android/app/src/main/res/values/strings.xml

@@ -1,94 +1,394 @@
+<?xml version="1.0" encoding="utf-8"?>
 <resources>
+    <!-- ============================= -->
+    <!-- APP IDENTITY                  -->
+    <!-- ============================= -->
     <string name="app_name">Simple Notes</string>
     
-    <!-- Main Activity -->
+    <!-- ============================= -->
-    <string name="no_notes_yet">Noch keine Notizen.\nTippe + um eine zu erstellen.</string>
+    <!-- MAIN SCREEN                   -->
-    <string name="add_note">Notiz hinzufügen</string>
+    <!-- ============================= -->
-    <string name="sync">Synchronisieren</string>
+    <string name="main_title">Simple Notes</string>
-    <string name="settings">Einstellungen</string>
+    <string name="no_notes_yet">No notes yet.\nTap + to create one.</string>
+    <string name="add_note">Add note</string>
+    <string name="sync">Sync</string>
+    <string name="settings">Settings</string>
+    <string name="action_sync">Sync</string>
+    <string name="action_settings">Settings</string>
+    <string name="action_close_selection">Close selection</string>
+    <string name="action_select_all">Select all</string>
+    <string name="action_delete_selected">Delete selected</string>
+    <string name="selection_count">%d selected</string>
     
-    <!-- Empty State -->
+    <!-- ============================= -->
+    <!-- EMPTY STATE                   -->
+    <!-- ============================= -->
     <string name="empty_state_emoji">📝</string>
-    <string name="empty_state_title">Noch keine Notizen</string>
+    <string name="empty_state_title">No notes yet</string>
-    <string name="empty_state_message">Tippe auf ➕ um deine erste Notiz zu erstellen</string>
+    <string name="empty_state_message">Tap + to create a new note</string>
     
-    <!-- Note Editor -->
+    <!-- ============================= -->
-    <string name="edit_note">Notiz bearbeiten</string>
+    <!-- FAB MENU                      -->
-    <string name="new_note">Neue Notiz</string>
+    <!-- ============================= -->
-    <string name="title">Titel</string>
+    <string name="fab_new_note">New note</string>
-    <string name="content">Inhalt</string>
+    <string name="fab_text_note">Text note</string>
-    <string name="save">Speichern</string>
+    <string name="fab_checklist">Checklist</string>
-    <string name="delete">Löschen</string>
+    <string name="create_text_note">Note</string>
-    <string name="back">Zurück</string>
+    <string name="create_checklist">List</string>
     
-    <!-- Note List Item (Preview placeholders) -->
+    <!-- ============================= -->
+    <!-- NOTE CARD                     -->
+    <!-- ============================= -->
     <string name="note_title_placeholder">Note Title</string>
     <string name="note_content_placeholder">Note content preview…</string>
-    <string name="note_timestamp_placeholder">Vor 2 Std</string>
+    <string name="note_timestamp_placeholder">2 hours ago</string>
-    <string name="untitled">Ohne Titel</string>
+    <string name="untitled">Untitled</string>
+    <string name="checklist_progress">%1$d/%2$d done</string>
+    <string name="empty_checklist">No entries</string>
     
-    <!-- Delete Confirmation Dialog -->
+    <!-- ============================= -->
-    <string name="delete_note_title">Notiz löschen?</string>
+    <!-- SYNC STATUS BANNER            -->
-    <string name="delete_note_message">Diese Aktion kann nicht rückgängig gemacht werden.</string>
+    <!-- ============================= -->
-    <string name="cancel">Abbrechen</string>
+    <string name="sync_status">Sync Status</string>
+    <string name="sync_syncing">Syncing…</string>
+    <string name="sync_completed">Synced</string>
+    <string name="sync_error">Error</string>
+    <string name="sync_status_syncing">Syncing…</string>
+    <string name="sync_status_completed">Sync completed</string>
+    <string name="sync_status_error">Sync failed</string>
+    <string name="sync_already_running">Sync already in progress</string>
     
-    <!-- Settings -->
+    <!-- ============================= -->
-    <string name="server_settings">Server-Einstellungen</string>
+    <!-- DELETE DIALOGS                -->
+    <!-- ============================= -->
+    <string name="delete_note_title">Delete note?</string>
+    <string name="delete_notes_title">Delete %d notes?</string>
+    <string name="delete_note_message">How do you want to delete this note?</string>
+    <string name="delete_notes_message">How do you want to delete these %d notes?</string>
+    <string name="delete_everywhere">Delete everywhere (also server)</string>
+    <string name="delete_local_only">Delete local only</string>
+    <string name="delete">Delete</string>
+    <string name="cancel">Cancel</string>
+    <string name="ok">OK</string>
+    <!-- Legacy delete dialogs -->
+    <string name="legacy_delete_dialog_title">Delete note</string>
+    <string name="legacy_delete_dialog_message">\"%s\" will be deleted locally.\n\nAlso delete from server?</string>
+    <string name="legacy_delete_from_server">Delete from server</string>
+    <string name="legacy_delete_with_server">\"%s\" will be deleted locally and from server</string>
+    <string name="legacy_delete_local_only">\"%s\" deleted locally (server remains)</string>
+    
+    <!-- ============================= -->
+    <!-- SNACKBAR MESSAGES             -->
+    <!-- ============================= -->
+    <string name="snackbar_undo">UNDO</string>
+    <string name="snackbar_note_deleted_local">\"%s\" deleted locally</string>
+    <string name="snackbar_note_deleted_server">\"%s\" will be deleted from server</string>
+    <string name="snackbar_notes_deleted_local">%d note(s) deleted locally</string>
+    <string name="snackbar_notes_deleted_server">%d note(s) will be deleted from server</string>
+    <string name="snackbar_deleted_from_server">Deleted from server</string>
+    <string name="snackbar_server_delete_failed">Server deletion failed</string>
+    <string name="snackbar_server_error">Server error: %s</string>
+    <string name="snackbar_already_synced">Already synced</string>
+    <string name="snackbar_server_unreachable">Server not reachable</string>
+    <string name="snackbar_synced_count">✅ Synced: %d notes</string>
+    
+    <!-- ============================= -->
+    <!-- URL VALIDATION ERRORS         -->
+    <!-- ============================= -->
+    <string name="error_http_local_only">HTTP is only allowed for local servers (e.g. 192.168.x.x, 10.x.x.x, nas.local). For public servers, please use HTTPS.</string>
+    <string name="error_invalid_protocol">Invalid protocol: %s. Please use HTTP or HTTPS.</string>
+    <string name="error_invalid_url">Invalid URL: %s</string>
+    <string name="error_server_not_configured">WebDAV server not fully configured</string>
+    <string name="error_sardine_client_failed">Sardine client could not be created</string>
+    <string name="error_server_url_not_configured">Server URL not configured</string>
+    
+    <!-- ============================= -->
+    <!-- NOTE EDITOR                   -->
+    <!-- ============================= -->
+    <string name="new_note">New Note</string>
+    <string name="edit_note">Edit Note</string>
+    <string name="new_checklist">New List</string>
+    <string name="edit_checklist">Edit List</string>
+    <string name="title">Title</string>
+    <string name="content">Content</string>
+    <string name="back">Back</string>
+    <string name="save">Save</string>
+    <string name="add_item">Add item</string>
+    <string name="item_placeholder">New item…</string>
+    <string name="reorder_item">Reorder item</string>
+    <string name="drag_to_reorder">Drag to reorder</string>
+    <string name="delete_item">Delete item</string>
+    <string name="note_is_empty">Note is empty</string>
+    <string name="note_saved">Note saved</string>
+    <string name="note_deleted">Note deleted</string>
+    
+    <!-- ============================= -->
+    <!-- SETTINGS - MAIN               -->
+    <!-- ============================= -->
+    <string name="settings_title">Settings</string>
+    <string name="settings_language">Language</string>
+    <string name="settings_language_subtitle">%s</string>
+    <string name="settings_server">Server Settings</string>
+    <string name="settings_server_status_reachable">✅ Reachable</string>
+    <string name="settings_server_status_unreachable">❌ Not reachable</string>
+    <string name="settings_server_status_checking">🔍 Checking…</string>
+    <string name="settings_server_status_not_configured">⚠️ Not configured</string>
+    <string name="settings_sync">Sync Settings</string>
+    <string name="settings_sync_auto_on">Auto-Sync: On • %s</string>
+    <string name="settings_sync_auto_off">Auto-Sync: Off</string>
+    <string name="settings_interval_15min">15 min</string>
+    <string name="settings_interval_30min">30 min</string>
+    <string name="settings_interval_60min">60 min</string>
+    <string name="settings_markdown">Markdown Desktop Integration</string>
+    <string name="settings_markdown_auto_on">Auto-Sync: On</string>
+    <string name="settings_markdown_auto_off">Auto-Sync: Off</string>
+    <string name="settings_backup">Backup &amp; Restore</string>
+    <string name="settings_backup_subtitle">Local or server backup</string>
+    <string name="settings_about">About this App</string>
+    <string name="settings_debug">Debug &amp; Diagnostics</string>
+    <string name="settings_debug_logging_on">Logging: On</string>
+    <string name="settings_debug_logging_off">Logging: Off</string>
+    
+    <!-- ============================= -->
+    <!-- SETTINGS - SERVER             -->
+    <!-- ============================= -->
+    <string name="server_settings">Server Settings</string>
+    <string name="server_settings_title">Server Settings</string>
+    <string name="server_connection_type">Connection Type</string>
+    <string name="server_connection_http">🏠 Internal (HTTP)</string>
+    <string name="server_connection_https">🌐 External (HTTPS)</string>
+    <string name="server_connection_http_hint">HTTP only for local networks (e.g. 192.168.x.x, 10.x.x.x)</string>
+    <string name="server_connection_https_hint">HTTPS for secure connections over the internet</string>
+    <string name="server_address">Server Address</string>
+    <string name="server_address_hint">e.g. http://192.168.0.188:8080/notes</string>
     <string name="server_url">Server URL</string>
-    <string name="username">Benutzername</string>
+    <string name="username">Username</string>
-    <string name="password">Passwort</string>
+    <string name="password">Password</string>
-    <string name="server_status_label">Server-Status:</string>
+    <string name="server_password_show">Show</string>
-    <string name="server_status_checking">Prüfe…</string>
+    <string name="server_password_hide">Hide</string>
-    <string name="test_connection">Verbindung testen</string>
+    <string name="server_status_label">Server Status:</string>
-    <string name="sync_now">Jetzt synchronisieren</string>
+    <string name="server_status_reachable">✅ Reachable</string>
+    <string name="server_status_unreachable">❌ Not reachable</string>
+    <string name="server_status_checking">🔍 Checking…</string>
+    <string name="server_status_not_configured">⚠️ Not configured</string>
+    <string name="server_status_unknown">❓ Unknown</string>
+    <string name="test_connection">Test Connection</string>
+    <string name="sync_now">Sync now</string>
     
-    <!-- Auto-Sync Settings -->
+    <!-- ============================= -->
-    <string name="sync_settings">Sync-Einstellungen</string>
+    <!-- SETTINGS - SYNC               -->
-    <string name="auto_sync">Auto-Sync aktiviert</string>
+    <!-- ============================= -->
-    <string name="sync_status">Sync-Status</string>
+    <string name="sync_settings">Sync Settings</string>
-    <string name="auto_sync_info">ℹ️ Auto-Sync:\n\n• Prüft alle 30 Min ob Server erreichbar\n• Funktioniert bei jeder WiFi-Verbindung\n• Läuft auch im Hintergrund\n• Minimaler Akkuverbrauch (~0.4%%/Tag)</string>
+    <string name="sync_settings_title">Sync Settings</string>
+    <string name="auto_sync">Auto-Sync enabled</string>
+    <string name="sync_auto_sync_info">🔄 Auto-Sync:\n• Checks every 30 min if server is reachable\n• Works on any WiFi connection\n• Runs in background\n• Minimal battery usage (~0.4%/day)</string>
+    <string name="sync_auto_sync_enabled">Auto-Sync enabled</string>
+    <string name="sync_interval_section">Sync Interval</string>
+    <string name="sync_interval_info">Determines how often the app syncs in the background. Shorter intervals mean more up-to-date data, but use slightly more battery.\n\n⏱️ Note: When your phone is in standby, Android may delay syncs (up to 60 min) to save battery. This is normal and affects all background apps.</string>
+    <string name="sync_interval_15min_title">⚡ Every 15 minutes</string>
+    <string name="sync_interval_15min_subtitle">Fastest sync • ~0.8% battery/day (~23 mAh)</string>
+    <string name="sync_interval_30min_title">✓ Every 30 minutes (Recommended)</string>
+    <string name="sync_interval_30min_subtitle">Balanced ratio • ~0.4% battery/day (~12 mAh)</string>
+    <string name="sync_interval_60min_title">🔋 Every 60 minutes</string>
+    <string name="sync_interval_60min_subtitle">Maximum battery life • ~0.2% battery/day (~6 mAh est.)</string>
+    <!-- Legacy -->
+    <string name="auto_sync_info">ℹ️ Auto-Sync:\n\n• Checks every 30 min if server is reachable\n• Works on any WiFi connection\n• Runs in background\n• Minimal battery usage (~0.4%%/day)</string>
     
-    <!-- Backup & Restore -->
+    <!-- ============================= -->
-    <string name="backup_restore_title">Backup &amp; Wiederherstellung</string>
+    <!-- SETTINGS - MARKDOWN           -->
-    <string name="backup_restore_warning">⚠️ Achtung:\n\nDie Wiederherstellung überschreibt ALLE lokalen Notizen mit den Daten vom Server. Diese Aktion kann nicht rückgängig gemacht werden!</string>
+    <!-- ============================= -->
-    <string name="restore_from_server">Vom Server wiederherstellen</string>
+    <string name="markdown_settings_title">Markdown Desktop Integration</string>
-    <string name="restore_confirmation_title">⚠️ Vom Server wiederherstellen?</string>
+    <string name="markdown_dialog_title">Markdown Auto-Sync</string>
-    <string name="restore_confirmation_message">WARNUNG: Alle lokalen Notizen werden gelöscht und durch die Notizen vom Server ersetzt.\n\nDieser Vorgang kann nicht rückgängig gemacht werden!</string>
+    <string name="markdown_export_complete">✅ Export complete</string>
-    <string name="restore_button">Wiederherstellen</string>
+    <string name="markdown_export_progress">Exporting %1$d/%2$d notes…</string>
-    <string name="restore_progress">Stelle Notizen wieder her…</string>
+    <string name="markdown_info">📝 Exports notes additionally as .md files. Mount WebDAV as network drive to edit with VS Code, Typora, or any Markdown editor. JSON sync remains primary format.</string>
-    <string name="restore_success">✓ %d Notizen wiederhergestellt</string>
+    <string name="markdown_auto_sync_title">Markdown Auto-Sync</string>
-    <string name="restore_error">Fehler: %s</string>
+    <string name="markdown_auto_sync_subtitle">Automatically syncs notes as .md files (upload + download on each sync)</string>
+    <string name="markdown_manual_sync_info">Manual sync exports all notes as .md files and imports .md files from the server. Useful for one-time sync.</string>
+    <string name="markdown_manual_sync_button">📝 Manual Markdown Sync</string>
     
-    <!-- Sync Status Banner (v1.3.1) -->
+    <!-- ============================= -->
-    <string name="sync_status_syncing">Synchronisiere…</string>
+    <!-- SETTINGS - BACKUP             -->
-    <string name="sync_status_completed">Synchronisierung abgeschlossen</string>
+    <!-- ============================= -->
-    <string name="sync_status_error">Synchronisierung fehlgeschlagen</string>
+    <string name="backup_settings_title">Backup &amp; Restore</string>
-    <string name="sync_already_running">Synchronisierung läuft bereits</string>
+    <string name="backup_restore_title">Backup &amp; Restore</string>
+    <string name="backup_auto_info">📦 A safety backup is automatically created before each restore.</string>
+    <string name="backup_local_section">Local Backup</string>
+    <string name="backup_create">💾 Create Backup</string>
+    <string name="backup_restore_file">📂 Restore from File</string>
+    <string name="backup_server_section">Server Backup</string>
+    <string name="backup_restore_server">☁️ Restore from Server</string>
+    <string name="backup_restore_dialog_title">⚠️ Restore Backup?</string>
+    <string name="backup_restore_source">Source: %s</string>
+    <string name="backup_restore_source_file">Local File</string>
+    <string name="backup_restore_source_server">WebDAV Server</string>
+    <string name="backup_restore_mode_label">Restore Mode:</string>
+    <string name="backup_mode_merge_title">⚪ Merge (Default)</string>
+    <string name="backup_mode_merge_subtitle">Add new, keep existing</string>
+    <string name="backup_mode_merge_full">⚪ Merge (Default)\n   → Add new, keep existing</string>
+    <string name="backup_mode_replace_title">⚪ Replace</string>
+    <string name="backup_mode_replace_subtitle">Delete all &amp; import backup</string>
+    <string name="backup_mode_replace_full">⚪ Replace\n   → Delete all &amp; import backup</string>
+    <string name="backup_mode_overwrite_title">⚪ Overwrite duplicates</string>
+    <string name="backup_mode_overwrite_subtitle">Backup wins on conflicts</string>
+    <string name="backup_mode_overwrite_full">⚪ Overwrite duplicates\n   → Backup wins on conflicts</string>
+    <string name="backup_restore_info">ℹ️ A safety backup will be automatically created before restoring.</string>
+    <string name="backup_restore_button">Restore</string>
+    <!-- Legacy -->
+    <string name="backup_restore_warning">⚠️ Warning:\n\nRestoring will overwrite ALL local notes with data from the server. This action cannot be undone!</string>
+    <string name="restore_from_server">Restore from Server</string>
+    <string name="restore_confirmation_title">⚠️ Restore from Server?</string>
+    <string name="restore_confirmation_message">WARNING: All local notes will be deleted and replaced with notes from the server.\n\nThis action cannot be undone!</string>
+    <string name="restore_button">Restore</string>
+    <string name="restore_progress">Restoring notes…</string>
+    <string name="restore_success">✓ %d notes restored</string>
+    <string name="restore_error">Error: %s</string>
     
-    <!-- Debug/Logging Section (v1.3.2) -->
+    <!-- ============================= -->
-    <string name="file_logging_privacy_notice">ℹ️ Datenschutz: Logs werden nur lokal auf deinem Gerät gespeichert und niemals an externe Server gesendet. Die Logs enthalten Sync-Aktivitäten zur Fehlerdiagnose. Du kannst sie jederzeit löschen oder exportieren.</string>
+    <!-- SETTINGS - DEBUG              -->
+    <!-- ============================= -->
+    <string name="debug_settings_title">Debug &amp; Diagnostics</string>
+    <string name="debug_file_logging_title">File Logging</string>
+    <string name="debug_file_logging_subtitle">Save sync logs to file</string>
+    <string name="debug_privacy_info">🔒 Privacy: Logs are only stored locally on your device and are never sent to external servers. Logs contain sync activities for troubleshooting. You can delete or export them at any time.</string>
+    <string name="debug_log_actions_section">Log Actions</string>
+    <string name="debug_export_logs">📤 Export &amp; Share Logs</string>
+    <string name="debug_logs_subject">SimpleNotes Sync Logs</string>
+    <string name="debug_logs_share_via">Share logs via…</string>
+    <string name="debug_delete_logs">🗑️ Delete Logs</string>
+    <string name="debug_delete_logs_title">Delete logs?</string>
+    <string name="debug_delete_logs_message">All saved sync logs will be permanently deleted.</string>
+    <!-- Legacy -->
+    <string name="file_logging_privacy_notice">ℹ️ Privacy: Logs are only stored locally on your device and are never sent to external servers. Logs contain sync activities for troubleshooting. You can delete or export them at any time.</string>
     
-    <!-- ========================== -->
+    <!-- ============================= -->
-    <!-- CHECKLIST FEATURE (v1.4.0) -->
+    <!-- SETTINGS - LANGUAGE           -->
-    <!-- ========================== -->
+    <!-- ============================= -->
+    <string name="language_settings_title">Language</string>
+    <string name="language_system_default">System Default</string>
+    <string name="language_english">English</string>
+    <string name="language_german">Deutsch</string>
+    <string name="language_info">ℹ️ Choose your preferred language. The app will restart to apply the change.</string>
+    <string name="language_changed_restart">Language changed. Restarting…</string>
     
-    <!-- FAB Menu -->
+    <!-- ============================= -->
-    <string name="create_text_note">Notiz</string>
+    <!-- SETTINGS - ABOUT              -->
-    <string name="create_checklist">Liste</string>
+    <!-- ============================= -->
+    <string name="about_settings_title">About this App</string>
+    <string name="about_app_name">Simple Notes Sync</string>
+    <string name="about_version">Version %1$s (%2$d)</string>
+    <string name="about_links_section">Links</string>
+    <string name="about_github_title">GitHub Repository</string>
+    <string name="about_github_subtitle">Source code, issues &amp; documentation</string>
+    <string name="about_developer_title">Developer</string>
+    <string name="about_developer_subtitle">GitHub Profile: @inventory69</string>
+    <string name="about_license_title">License</string>
+    <string name="about_license_subtitle">MIT License - Open Source</string>
+    <string name="about_privacy_title">🔒 Privacy</string>
+    <string name="about_privacy_text">This app collects no data. All notes are stored only locally on your device and on your own WebDAV server. No telemetry, no ads.</string>
     
-    <!-- Editor -->
+    <!-- ============================= -->
-    <string name="new_checklist">Neue Liste</string>
+    <!-- TOAST MESSAGES                -->
-    <string name="edit_checklist">Liste bearbeiten</string>
+    <!-- ============================= -->
-    <string name="add_item">Element hinzufügen</string>
+    <string name="toast_connection_success">✅ Connection successful!</string>
-    <string name="item_placeholder">Neues Element…</string>
+    <string name="toast_connection_failed">❌ %s</string>
-    <string name="reorder_item">Element verschieben</string>
+    <string name="toast_error">❌ Error: %s</string>
-    <string name="drag_to_reorder">Ziehen zum Sortieren</string>
+    <string name="toast_syncing">🔄 Syncing…</string>
-    <string name="delete_item">Element löschen</string>
+    <string name="toast_already_synced">✅ Already synced</string>
-    <string name="note_is_empty">Notiz ist leer</string>
+    <string name="toast_sync_success">✅ %d notes synced</string>
-    <string name="note_saved">Notiz gespeichert</string>
+    <string name="toast_sync_failed">❌ %s</string>
-    <string name="note_deleted">Notiz gelöscht</string>
+    <string name="toast_auto_sync_enabled">✅ Auto-Sync enabled</string>
+    <string name="toast_auto_sync_disabled">Auto-Sync disabled</string>
+    <string name="toast_sync_interval">⏱️ Sync interval: %s</string>
+    <string name="toast_sync_interval_15min">15 minutes</string>
+    <string name="toast_sync_interval_30min">30 minutes</string>
+    <string name="toast_sync_interval_60min">60 minutes</string>
+    <string name="toast_configure_server_first">⚠️ Please configure WebDAV server first</string>
+    <string name="toast_markdown_exported">✅ %d notes exported to Markdown</string>
+    <string name="toast_markdown_enabled">📝 Markdown Auto-Sync enabled</string>
+    <string name="toast_markdown_disabled">📝 Markdown Auto-Sync disabled</string>
+    <string name="toast_markdown_syncing">📝 Markdown sync running…</string>
+    <string name="toast_markdown_result">✅ Export: %1$d • Import: %2$d</string>
+    <string name="toast_export_failed">❌ Export failed: %s</string>
+    <string name="toast_backup_success">✅ %s</string>
+    <string name="toast_backup_failed">❌ Backup failed: %s</string>
+    <string name="toast_restore_success">✅ %d notes restored</string>
+    <string name="toast_restore_failed">❌ Restore failed: %s</string>
+    <string name="toast_notifications_enabled">Notifications enabled</string>
+    <string name="toast_notifications_disabled">Notifications disabled. You can enable them in settings.</string>
+    <string name="toast_battery_optimization">Please disable battery optimization manually</string>
+    <string name="toast_logs_deleted">🗑️ Logs deleted</string>
+    <string name="toast_no_logs_to_delete">📭 No logs to delete</string>
+    <string name="toast_logs_delete_error">❌ Error deleting: %s</string>
+    <string name="toast_link_error">❌ Error opening link</string>
+    <string name="toast_file_logging_enabled">📝 File logging enabled</string>
+    <string name="toast_file_logging_disabled">📝 File logging disabled</string>
+    <string name="toast_sync_interval_changed">⏱️ Sync interval changed to %s</string>
+    <string name="version_not_available">Version not available</string>
+    <string name="status_checking">🔍 Checking…</string>
+    <string name="battery_optimization_dialog_message">Please select \'Not optimized\' for Simple Notes.</string>
+    <string name="battery_optimization_dialog_title">Background Synchronization</string>
+    <string name="battery_optimization_dialog_full_message">For the app to sync in the background, battery optimization must be disabled.\n\nPlease select \'Not optimized\' for Simple Notes.</string>
+    <string name="battery_optimization_open_settings">Open Settings</string>
+    <string name="battery_optimization_later">Later</string>
+    <string name="content_description_back">Back</string>
+    <string name="error_invalid_backup_file">Invalid backup file</string>
+    <string name="error_backup_version_unsupported">Backup version not supported (v%1$d requires v%2$d+)</string>
+    <string name="error_backup_empty">Backup contains no notes</string>
+    <string name="error_backup_invalid_notes">Backup contains %d invalid notes</string>
+    <string name="error_backup_corrupt">Backup file corrupt or invalid: %s</string>
+    <string name="error_restore_failed">Restore failed: %s</string>
+    <string name="restore_merge_result">%1$d new notes imported, %2$d skipped</string>
+    <string name="restore_overwrite_result">%1$d new, %2$d overwritten</string>
+    <string name="restore_replace_result">All notes replaced: %d imported</string>
     
-    <!-- List Preview -->
+    <!-- ============================= -->
-    <string name="checklist_progress">%1$d/%2$d erledigt</string>
+    <!-- RELATIVE TIME                 -->
-    <string name="empty_checklist">Keine Einträge</string>
+    <!-- ============================= -->
+    <string name="time_just_now">Just now</string>
+    <string name="time_minutes_ago">%d min ago</string>
+    <string name="time_hours_ago">%d hours ago</string>
+    <string name="time_days_ago">%d days ago</string>
+    
+    <!-- ============================= -->
+    <!-- NOTIFICATIONS                 -->
+    <!-- ============================= -->
+    <string name="notification_channel_name">Notes Synchronization</string>
+    <string name="notification_channel_desc">Notifications about sync status</string>
+    <string name="notification_sync_success_title">Sync successful</string>
+    <string name="notification_sync_success_message">%d note(s) synchronized</string>
+    <string name="notification_sync_failed_title">Sync failed</string>
+    <string name="notification_sync_progress_title">Syncing…</string>
+    <string name="notification_sync_progress_message">Notes are being synchronized</string>
+    <string name="notification_sync_conflict_title">Sync conflict detected</string>
+    <string name="notification_sync_conflict_message">%d note(s) have conflicts</string>
+    <string name="notification_sync_warning_title">⚠️ Sync Warning</string>
+    <string name="notification_sync_warning_message">Server unreachable for %dh</string>
+    <string name="notification_sync_warning_detail">The WebDAV server has been unreachable for %d hours. Please check your network connection or server settings.</string>
+    <string name="notification_sync_in_progress_title">Synchronization in progress</string>
+    <string name="notification_sync_in_progress_message">Notes are being synchronized…</string>
+    <string name="notification_sync_error_title">Sync Error</string>
+    
+    <!-- ============================= -->
+    <!-- PLURALS                       -->
+    <!-- ============================= -->
+    <plurals name="notes_count">
+        <item quantity="one">%d note</item>
+        <item quantity="other">%d notes</item>
+    </plurals>
+    
+    <plurals name="notes_deleted_local">
+        <item quantity="one">%d note deleted locally</item>
+        <item quantity="other">%d notes deleted locally</item>
+    </plurals>
+    
+    <plurals name="notes_deleted_server">
+        <item quantity="one">%d note will be deleted from server</item>
+        <item quantity="other">%d notes will be deleted from server</item>
+    </plurals>
+    
+    <plurals name="notes_synced">
+        <item quantity="one">%d note synced</item>
+        <item quantity="other">%d notes synced</item>
+    </plurals>
 </resources>

android/app/src/main/res/xml/locales_config.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<locale-config xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- Default/Fallback language -->
+    <locale android:name="en" />
+    <!-- Supported languages -->
+    <locale android:name="de" />
+</locale-config>