feat(i18n): add bilingual support with language detection and switching
- Implement comprehensive i18n system with Spanish and English translations - Add automatic browser language detection with localStorage persistence - Add language toggle button to switch between Spanish and English - Create English word pools (Animals & Nature, Everyday Objects) - Add language filtering system to show only pools matching current language - Update all code comments and documentation to English - Fix mobile layout issues (scroll, button sizing, responsive design) - Add lang field to all word pools in manifest.json for proper filtering
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