Add comprehensive WCAG 2.2 accessibility research for bilingual web applications

- Documented WCAG success criteria for language (3.1.1, 3.1.2) and their implementation.
- Provided guidelines for accessible language switcher patterns, emphasizing link usage over `<select>`.
- Outlined AODA/Ontario specific requirements and their relation to bilingual content.
- Addressed RTL/bidirectional considerations, confirming no issues for English-French content.
- Analyzed screen reader behavior with language switching and its impact on accessibility.
- Discussed the importance of translation quality and its effect on cognitive accessibility.
- Included implementation recommendations for Next.js applications to ensure compliance.
- Added a checklist for WCAG 2.2 AA compliance during internationalization.

Author: emmanuelknafo