feat(v1.5.0): icons, batch delete toast, cursor fix, docs refactor

FEATURES
========

Batch Delete Toast Aggregation:
- New deleteMultipleNotesFromServer() method
- Shows single aggregated toast instead of multiple ("3 notes deleted from server")
- Partial success handling ("3 of 5 notes deleted from server")
- Added string resources: snackbar_notes_deleted_from_server, snackbar_notes_deleted_from_server_partial

Text Editor Cursor Fix:
- Fixed cursor jumping to end after every keystroke when editing notes
- Added initialCursorSet flag to only set cursor position on first load
- Cursor now stays at user's position while editing
- Changed LaunchedEffect(content) to LaunchedEffect(Unit) to prevent repeated resets

DOCUMENTATION REFACTOR
======================

Breaking Change: English is now the default language
- README.md: Now English (was German)
- QUICKSTART.md: Now English (was German)
- CHANGELOG.md: Now English (was mixed EN/DE)
- docs/*.md: All English (was German)
- German versions: Use .de.md suffix (README.de.md, QUICKSTART.de.md, etc.)

Updated for v1.5.0:
- CHANGELOG.md: Fully translated to English with v1.5.0 release notes
- CHANGELOG.de.md: Created German version
- FEATURES.md: Added i18n section, Selection Mode, Jetpack Compose updates
- FEATURES.de.md: Updated with v1.5.0 features
- UPCOMING.md: v1.5.0 marked as released, v1.6.0/v1.7.0 roadmap
- UPCOMING.de.md: Updated German version

All language headers updated:
- English: [Deutsch](*.de.md) · **English**
- German: **Deutsch** · [English](*.md)

F-DROID METADATA
================

Changelogs (F-Droid):
- fastlane/metadata/android/en-US/changelogs/13.txt: Created
- fastlane/metadata/android/de-DE/changelogs/13.txt: Created

Descriptions:
- full_description.txt (EN/DE): Updated with v1.5.0 changes
  - Selection Mode instead of Swipe-to-Delete
  - i18n support highlighted
  - Jetpack Compose UI mentioned
  - Silent-Sync Mode added

OTHER FIXES
===========

Code Quality:
- Unused imports removed from multiple files
- maxLineLength fixes
- Detekt config optimized (increased thresholds for v1.5.0)
- AboutScreen: Uses app foreground icon directly
- EmptyState: Shows app icon instead of emoji
- themes.xml: Splash screen uses app foreground icon

docs/TRANSLATING.md

@@ -0,0 +1,151 @@
+# Contributing Translations 🌍
+
+**🌍 Languages:** [Deutsch](TRANSLATING.de.md) · **English**
+
+> How to translate Simple Notes Sync into your language!
+
+---
+
+## 📋 Overview
+
+Simple Notes Sync currently supports:
+- 🇺🇸 **English** (en) - Primary language
+- 🇩🇪 **German** (de) - Fully translated
+
+We welcome new translations!
+
+---
+
+## 🚀 Quick Start
+
+### 1. Fork the Repository
+
+1. Go to [github.com/inventory69/simple-notes-sync](https://github.com/inventory69/simple-notes-sync)
+2. Click **Fork** (top right)
+3. Clone your fork: `git clone https://github.com/YOUR-USERNAME/simple-notes-sync.git`
+
+### 2. Create Language Files
+
+```bash
+cd simple-notes-sync/android/app/src/main/res
+
+# Create folder for your language (e.g., French)
+mkdir values-fr
+
+# Copy strings
+cp values/strings.xml values-fr/strings.xml
+```
+
+### 3. Translate Strings
+
+Open `values-fr/strings.xml` and translate all `<string>` entries:
+
+```xml
+<!-- Original (English) -->
+<string name="app_name">Simple Notes</string>
+<string name="notes_title">Notes</string>
+
+<!-- Translated (French) -->
+<string name="app_name">Notes Simples</string>
+<string name="notes_title">Notes</string>
+```
+
+**Important:**
+- Only translate text between `>` and `</string>`
+- Do NOT change `name="..."` attributes
+- Keep `%s`, `%d`, `%1$s` etc. as placeholders
+
+### 4. Update locales_config.xml
+
+Add your language to `android/app/src/main/res/xml/locales_config.xml`:
+
+```xml
+<locale-config xmlns:android="http://schemas.android.com/apk/res/android">
+    <locale android:name="en" />
+    <locale android:name="de" />
+    <locale android:name="fr" />  <!-- NEW -->
+</locale-config>
+```
+
+### 5. Create Pull Request
+
+1. Commit your changes
+2. Push to your fork
+3. Create a Pull Request with title: `Add [Language] translation`
+
+---
+
+## 📁 File Structure
+
+```
+android/app/src/main/res/
+├── values/              # English (Fallback)
+│   └── strings.xml
+├── values-de/           # German
+│   └── strings.xml
+├── values-fr/           # French (new)
+│   └── strings.xml
+└── xml/
+    └── locales_config.xml  # Language registration
+```
+
+---
+
+## 📝 String Categories
+
+The `strings.xml` contains about 400+ strings, divided into:
+
+| Category | Description | Count |
+|----------|-------------|-------|
+| UI Texts | Buttons, labels, titles | ~100 |
+| Settings | All 7 settings screens | ~150 |
+| Dialogs | Confirmations, errors | ~80 |
+| Sync | Synchronization messages | ~50 |
+| Other | Tooltips, accessibility | ~30 |
+
+---
+
+## ✅ Quality Checklist
+
+Before creating your Pull Request:
+
+- [ ] All strings translated (no English leftovers)
+- [ ] Placeholders (`%s`, `%d`) preserved
+- [ ] No XML syntax errors
+- [ ] App launches without crashes
+- [ ] Text fits in UI elements (not too long)
+- [ ] `locales_config.xml` updated
+
+---
+
+## 🔧 Testing
+
+```bash
+cd android
+./gradlew app:assembleDebug
+
+# Install APK and switch language in Android settings
+```
+
+---
+
+## ❓ FAQ
+
+**Do I need to translate all strings?**
+> Ideally yes. Missing strings fall back to English.
+
+**What about placeholders?**
+> `%s` = text, `%d` = number. Keep position or use `%1$s` for numbering.
+
+**How do I test my translation?**
+> Build app, install, go to Android Settings → Apps → Simple Notes → Language.
+
+---
+
+## 🙏 Thank You!
+
+Every translation helps Simple Notes Sync reach more people.
+
+Questions? [Create a GitHub Issue](https://github.com/inventory69/simple-notes-sync/issues)
+
+[← Back to Documentation](DOCS.md)