Add Latvian language localization

[EPoikans]

Closes #300

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.54%. Comparing base (aab9dab) to head (d606efd).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #301   +/-   ##
=======================================
  Coverage   99.53%   99.54%           
=======================================
  Files          11       11           
  Lines         868      871    +3     
=======================================
+ Hits          864      867    +3     
  Misses          4        4           

Flag	Coverage Δ
macos-latest	97.47% <100.00%> (+<0.01%)	⬆️
ubuntu-latest	97.47% <100.00%> (+<0.01%)	⬆️
windows-latest	95.52% <33.33%> (-0.34%)	⬇️

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[Jeecis]

lgtm, I am Latvian.

[EPoikans]

It appears Latvian translation also is affected by dative and nominative cases not being handled like described here - #263

[hugovk]

Thanks both!