Test improvements

[raivisdejus]

Adding translations to tests, so they also work in non-english locales. Also adding a test for locale and main app. Test for main app mainly for test coverage scores

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 74.19%. Comparing base (38f5d26) to head (66d4d79).
Report is 6 commits behind head on main.

Files	Patch %	Lines
buzz/buzz.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #755      +/-   ##
==========================================
- Coverage   81.28%   74.19%   -7.09%     
==========================================
  Files          81       83       +2     
  Lines        3617     3891     +274     
==========================================
- Hits         2940     2887      -53     
- Misses        677     1004     +327     

Flag	Coverage Δ
Linux	74.19% <60.00%> (?)
Windows	?

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