Carsten Graf 936db67ba4 Add bilingual support (German/English) with language selector ...

- Added language selector in top-left corner
- Implemented data attributes for all translatable text
- Created language management system with localStorage persistence
- Updated all JavaScript functions to support both languages
- Added translations for notifications, error messages, and UI elements
- Maintained existing functionality while adding language switching

2025-09-10 18:42:56 +02:00

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