fix: show language names in original language

[pc-beast]

Fixes #5347

Short description of what this resolves:

It changes the the language names to the original languages respectively.

Checklist

• I have read the Contribution & Best practices Guide.
• My branch is up-to-date with the Upstream development branch.
• The acceptance, integration, unit tests and linter pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Before:

After:

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[codecov]

Codecov Report

Merging #5353 into development will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           development    #5353   +/-   ##
============================================
  Coverage        22.78%   22.78%           
============================================
  Files              491      491           
  Lines             5245     5245           
  Branches            37       37           
============================================
  Hits              1195     1195           
  Misses            4045     4045           
  Partials             5        5           

Impacted Files	Coverage Δ
app/services/l10n.js	62.50% <ø> (ø)

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[mariobehling]

Unfortunately spelling is wrong in several languages. Also capital/non caps is not following any standard and languages are not sorted in any logical way. You could compare how this work e.g. on eventbrite, Wikipedia etc. For the sorting I also recommend we follow Wikipedia.