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

CHANGELOG.md

@@ -4,33 +4,79 @@ All notable changes to Simple Notes Sync will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
+**🌍 Languages:** [Deutsch](CHANGELOG.de.md) · **English**
+
+---
+
+## [1.5.0] - 2026-01-15
+
+### 🎉 Major: Jetpack Compose UI Redesign
+
+The complete UI has been migrated from XML Views to Jetpack Compose. The app is now more modern, faster, and smoother.
+
+### 🌍 New Feature: Internationalization (i18n)
+
+- **English language support** - All 400+ strings translated
+- **Automatic language detection** - Follows system language
+- **Manual language selection** - Switchable in settings
+- **Per-App Language (Android 13+)** - Native language setting via system settings
+- **locales_config.xml** - Complete Android integration
+
+### ⚙️ Modernized Settings
+
+- **7 categorized settings screens** - Clearer and more intuitive
+- **Compose Navigation** - Smooth transitions between screens
+- **Consistent design** - Material Design 3 throughout
+
+### ✨ UI Improvements
+
+- **Selection Mode** - Long-press for multi-select instead of swipe-to-delete
+- **Batch Delete** - Delete multiple notes at once
+- **Silent-Sync Mode** - No banner during auto-sync (only for manual sync)
+- **App Icon in About Screen** - High-quality display
+- **App Icon in Empty State** - Instead of emoji when note list is empty
+- **Splash Screen Update** - Uses app foreground icon
+- **Slide Animations** - Smooth animations in NoteEditor
+
+### 🔧 Technical Improvements
+
+- **Jetpack Compose** - Complete UI migration
+- **Compose ViewModel Integration** - StateFlow for reactive UI
+- **Improved Code Quality** - Detekt/Lint warnings fixed
+- **Unused Imports Cleanup** - Cleaner codebase
+
+### Looking Ahead
+
+> 🚀 **v1.6.0** will bring server folder checking and further technical modernizations.
+> Feature requests welcome as [GitHub Issue](https://github.com/inventory69/simple-notes-sync/issues).
+
 ---
 
 ## [1.4.1] - 2026-01-11
 
 ### Fixed
 
-- **🗑️ Löschen älterer Notizen (v1.2.0 Kompatibilität)**
-  - Notizen aus App-Version v1.2.0 oder früher werden jetzt korrekt vom Server gelöscht
-  - Behebt Problem bei Multi-Device-Nutzung mit älteren Notizen
+- **🗑️ Deleting older notes (v1.2.0 compatibility)**
+  - Notes from app version v1.2.0 or earlier are now correctly deleted from the server
+  - Fixes issue with multi-device usage with older notes
 
-- **🔄 Checklisten-Sync Abwärtskompatibilität**
-  - Checklisten werden jetzt auch als Text-Fallback im `content`-Feld gespeichert
-  - Ältere App-Versionen (v1.3.x) zeigen Checklisten als lesbaren Text
-  - Format: GitHub-Style Task-Listen (`[ ] Item` / `[x] Item`)
-  - Recovery-Mode: Falls Checklisten-Items verloren gehen, werden sie aus dem Content wiederhergestellt
+- **🔄 Checklist sync backward compatibility**
+  - Checklists now also saved as text fallback in the `content` field
+  - Older app versions (v1.3.x) display checklists as readable text
+  - Format: GitHub-style task lists (`[ ] Item` / `[x] Item`)
+  - Recovery mode: If checklist items are lost, they are recovered from content
 
 ### Improved
 
-- **📝 Checklisten Auto-Zeilenumbruch**
-  - Lange Checklisten-Texte werden jetzt automatisch umgebrochen
-  - Keine Begrenzung auf 3 Zeilen mehr
-  - Enter-Taste erstellt weiterhin ein neues Item
+- **📝 Checklist auto line-wrap**
+  - Long checklist texts now automatically wrap
+  - No more limit to 3 lines
+  - Enter key still creates a new item
 
 ### Looking Ahead
 
-> 🚀 **v1.5.0** wird das nächste größere Release. Wir sammeln Ideen und Feedback!  
-> Feature-Requests gerne als [GitHub Issue](https://github.com/inventory69/simple-notes-sync/issues) einreichen.
+> 🚀 **v1.5.0** will be the next major release. We're collecting ideas and feedback!
+> Feature requests welcome as [GitHub Issue](https://github.com/inventory69/simple-notes-sync/issues).
 
 ---