Implement proper locale check

[arkadiuszbachorski]

Implement proper locale check

♻️ Current situation & Problem

Closes #20

⚙️ Release Notes

• Implement proper locale check

Code of Conduct & Contributing Guidelines

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• I agree to follow the Code of Conduct and Contributing Guidelines.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 25.13%. Comparing base (bdcc14c) to head (56a7cc0).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #60      +/-   ##
==========================================
+ Coverage   24.72%   25.13%   +0.41%     
==========================================
  Files         213      214       +1     
  Lines        7327     7356      +29     
  Branches      340      352      +12     
==========================================
+ Hits         1811     1848      +37     
+ Misses       5394     5387       -7     
+ Partials      122      121       -1     

Files with missing lines	Coverage Δ
modules/firebase/localizedText.ts	100.00% <100.00%> (+100.00%)	⬆️
packages/design-system/src/utils/navigator.ts	100.00% <100.00%> (ø)

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