Reimplement sync translations

[kostadin-damyanov-prime]

This PR reimplements the sync_translations.py script in dart. This way we do not depend on other languages.
Also this PR formats the l10n sources.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.96%. Comparing base (d2dc518) to head (1523144).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1034   +/-   ##
========================================
  Coverage    95.96%   95.96%           
========================================
  Files           47       47           
  Lines         1040     1040           
========================================
  Hits           998      998           
  Misses          42       42           

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