Implemented comprehensive internationalization (i18n) for both frontend and backend:
Frontend:
- Added react-i18next configuration with Spanish (default) and English
- Created translation files (locales/es.json, locales/en.json)
- Refactored core components to use i18n: LoginPage, DashboardHeader, DataUploader
- Created LanguageSelector component with toggle between ES/EN
- Updated API client to send Accept-Language header
Backend:
- Created i18n module with translation dictionary for error messages
- Updated security.py to return localized authentication errors
- Updated api/analysis.py to return localized validation errors
- Implemented language detection from Accept-Language header
Spanish remains the default language ensuring backward compatibility.
Users can switch between languages using the language selector in the dashboard header.
https://claude.ai/code/session_1N9VX
