feat(i18n): Implement multi-language support across the application
- Added language switcher component for user locale selection.
- Integrated translations for English, German, Spanish (MX and LA), French, Japanese, Korean, and Portuguese (BR).
- Updated pages (app, contact, index, privacy, terms) to utilize translations for titles, subtitles, and other text elements.
- Modified middleware to handle locale detection from cookies and Accept-Language header.
- Adjusted HTML lang attributes dynamically based on user locale.
- Set prerender to false for pages to support dynamic content based on locale.