feat: validate language code

[katerina20]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 10 lines in your changes missing coverage. Please review.

Project coverage is 64.52%. Comparing base (df576ef) to head (e5c950e).
Report is 12 commits behind head on main.

Files	Patch %	Lines
...om/crowdin/cli/properties/PropertiesWithFiles.java	0.00%	9 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #810      +/-   ##
============================================
- Coverage     64.63%   64.52%   -0.11%     
  Complexity     1487     1487              
============================================
  Files           223      223              
  Lines          6126     6137      +11     
  Branches        917      921       +4     
============================================
  Hits           3959     3959              
- Misses         1660     1669       +9     
- Partials        507      509       +2     

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