mamonov.ep 3e5c1be464 feat: add translation language setting & onboarding flow ...

- Add separate translation_language setting (independent from interface language)
- Implement 3-step onboarding for new users:
  1. Choose interface language
  2. Choose learning language
  3. Choose translation language
- Fix localization issues when using callback.message (user_id from state)
- Add UserService.get_user_by_id() method
- Add get_user_translation_lang() helper in i18n
- Update all handlers to use correct translation language
- Add localization keys for onboarding (ru/en/ja)

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Co-Authored-By: Claude <noreply@anthropic.com>

2025-12-07 16:35:08 +03:00

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