Improved i18n handling

[AlemTuzlak]

Fixes #

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[thomasfr]

While this definitely makes handling the language parameter in the code much easier, it also completely prevents the easy and cheap use of edge caching for HTML pages, with Cloudflare. Currently, you can safely cache everything on CF with a "Cache Rule" because a given URL always returns the same response for all website visitors. However, mixing query parameters and cookie values for the language parameter prevents automatic HTML edge caching through a "Cache Rule." Only with the Cloudflare Business Plan ($200/month/domain) can you use cookie values as part of the cache key.

I suggest not changing this for now, perhaps we can find a better solution that addresses both scenarios or document alternative approaches and their implications.