test(client, languages): adding unit tests

[vorobeyme]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 12.90%. Comparing base (357d54a) to head (c1b2894).

Files	Patch %	Lines
crowdin/crowdin.go	33.34%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            main      #15       +/-   ##
==========================================
+ Coverage   2.49%   12.90%   +10.41%     
==========================================
  Files         23       23               
  Lines       1046     1047        +1     
==========================================
+ Hits          26      135      +109     
+ Misses      1018      881      -137     
- Partials       2       31       +29     

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