[openstreetmap/openstreetmap-website] Use MediaWiki languagefallback (PR #6218)

[Marwin Hochfelsner]

Following the [suggestion](https://wikis.world/@LucasWerkmeister/114876146945706671) from @lucaswerkmeister to use the `languagefallback` parameter, requesting `OSM.preferred_languages` is still required to receive language variant-specific labels and descriptions.
e.g., OSM has `pt-PT`, MediaWiki doesn't.
Thanks @1ec5 for forwarding in https://github.com/openstreetmap/openstreetmap-website/pull/6127#discussion_r2220068035!
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/6218

-- Commit Summary --

  * Use MediaWiki languagefallback
  * Generalize localization reducing function

-- File Changes --

    M app/assets/javascripts/index/element.js (13)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/6218.patch
https://github.com/openstreetmap/openstreetmap-website/pull/6218.diff

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