Move language redirects to CF Functions

[Akarys42]

This PR removes all HTML redirects to use HTTP redirects (except /qsl)

• All language redirects are moved to dynamically generated Cloudflare Functions that smartly parse the Accept-Language header
• redirect_from is removed is favor of public/_redirects

[netlify[bot]]

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[cloudflare-pages[bot]]

Deploying with    Cloudflare Pages

Latest commit:	f48815d
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[Akarys42]

Ready for review! Please disregard Netlify