fix: properly name languages matching server

[susnux]

• resolves Public File Request guest identification dialog is not translated into Japanese #2581

see https://github.com/nextcloud/server/blob/c2f88ddcbc3715264630e0c92c22467be0a94524/.tx/config#L3

🤖 AI (if applicable)

• The content of this PR was partly or fully generated using AI

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.74%. Comparing base (be026c8) to head (1c930bb).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2620   +/-   ##
=======================================
  Coverage   61.74%   61.74%           
=======================================
  Files          15       15           
  Lines         481      481           
  Branches      104      104           
=======================================
  Hits          297      297           
  Misses        165      165           
  Partials       19       19           

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