Document multi-language support and app-wide text scaling in README

Adds Key Features bullets covering the EN/DE localization (device
language default, English fallback, in-app/system per-app language
settings, POEditor sync) and the app-wide text-size slider for tablets,
foldables, and Android Automotive.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: nichu42

README.md

@@ -28,15 +28,17 @@ Crafted with **Kotlin** and **Jetpack Compose** following Material Design 3 guid
 ## ✨ Key Features
 
 *   **📊 Live Interactive Dashboard**: Favorite and save specific environmental stations. Customize exactly which sensor metrics (Temperature, Humidity, UV, PM2.5, Barometric Pressure, etc.) you want to track at a glance.
-*   **📱 Glanceable Home Widgets**: Customize home screen widgets featuring Material Design 3 theme colors to monitor your favorite senseBox metrics. Supports text & icon scaling up to 200%, toggling detail styles (Full Details, Value & Unit, Value Only), conditional formatting, AQI display modes, and direct home-screen reconfiguration on Android 12+. 
+*   **📱 Glanceable Home Widgets**: Customize home screen widgets featuring Material Design 3 theme colors to monitor your favorite senseBox metrics. Supports per-widget text & icon scaling up to 200%, toggling detail styles (Full Details, Value & Unit, Value Only), conditional formatting, AQI display modes, and direct home-screen reconfiguration on Android 12+. 
 *   **🌬️ Air Quality Index Engine**: Six international AQI standards (US EPA, UK DAQI, EU EAQI, Canada AQHI, India, China) with a virtual synthesized sensor and 12-hour NowCast averaging computed locally from cached openSenseMap data.
 *   **📈 Rich Telemetry Analysis**: Deep telemetry streams visualization including units, last updated timestamps, coordinates, station type, and exposure type (indoor vs. outdoor).
 *   **🔍 Smart Discovery Engine**: Locate public senseBoxes from the openSenseMap community using direct search by name/ID, location address auto-complete, or on-demand GPS discovery.
 *   **🌡️ Local Unit Conversion**: Per-sensor unit switching for temperature (°C/°F/K), pressure (hPa/mbar/Pa/inHg/mmHg), and wind (m/s/km/h/mph/kn) performed entirely on-device.
+*   **🌐 Multi-Language Support**: BoxViewer currently ships in English and German and is prepared for additional languages.
 *   **🔗 Quick Sharing & Deep Linking**: Generate local QR codes to share senseBox stations. Recipients scan the code or open a sharing web link to view the station directly inside the BoxViewer app.
 *   **🔋 Battery & API-Friendly**: Seamless local SQLite caching (`SensorCacheEntity`) and awake-on-unlock widget refresh logic ensure you get fresh data without draining your battery or hammering openSenseMap servers.
 *   **🔒 Privacy-First & De-Googled Friendly**: 100% free of Google Play Services (GMS) dependencies in the app code. Core functionality relies on the native Android `LocationManager` and direct openSenseMap APIs. Address search and location labels may use the device’s native geocoder (ROM-dependent backend) or an OpenStreetMap-based fallback; see the Privacy Policy for details. Zero telemetry, analytics, or third-party trackers.
 *   **🛠️ Local API Debug Logging**: Opt-in to capture raw API requests, responses, and Moshi parsing results in a JSON Lines (`.jsonl`) file stored locally. Copy or share logs via native sheets to diagnose errors easily.
+*   **🔤 App-Wide Text Scaling**: A dedicated Settings slider lets you scale text throughout the UI (60%–200%) independently of the system font size, making BoxViewer comfortable on tablets, foldables, and Android Automotive displays.
 
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