🌐 Interface Localization:
- Added i18next for multi-language interface support
- Created LocalizationService with language detection
- Added translation files for Russian and English
- Implemented language selection in user settings
🤖 AI Profile Translation (Premium feature):
- Integrated DeepSeek API for profile translation
- Added TranslationController for translation management
- Premium-only access to profile translation feature
- Support for 10 languages (ru, en, es, fr, de, it, pt, zh, ja, ko)
�� Database & Models:
- Added language field to users table with migration
- Updated User model to support language preferences
- Added language constraints and indexing
🎛️ User Interface:
- Added language settings menu in bot settings
- Implemented callback handlers for language selection
- Added translate profile button for VIP users
- Localized all interface strings
📚 Documentation:
- Created comprehensive LOCALIZATION.md guide
- Documented API usage and configuration
- Added examples for extending language support
