add support for sr (Српски) language

[CollinBeczak]

resolves: #2297

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 23.59%. Comparing base (6435413) to head (589ec5a).

Files	Patch %	Lines
src/services/User/Locale/Locale.js	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2302      +/-   ##
==========================================
- Coverage   23.59%   23.59%   -0.01%     
==========================================
  Files         648      648              
  Lines       22497    22498       +1     
  Branches     6944     6944              
==========================================
  Hits         5308     5308              
- Misses      14366    14367       +1     
  Partials     2823     2823              

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