Add French translations for Tier 2 (Engagement) pages
- features-FR.md: Comprehensive French translation of Features page (345 lines) covering all QET capabilities, professional documentation, export options, standards support, and real-world use cases
- community-FR.md: Complete French translation of Community page (339 lines) with ways to get involved, community resources, contribution guidelines, and recognition
- tips_and_tricks-FR.md: Full French translation of Tips & Tricks page (510 lines) with advanced workflows, performance optimization, collaboration strategies, and industry-specific patterns
- languages.md: Updated translation status showing Tier 2 French translations complete (Features, Community, Tips & Tricks all ✅ for Français)
Expands French documentation to 8 complete pages across Tier 1 (Onboarding) and Tier 2 (Engagement) tiers.
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