Update Latvian translation

[andreyv]

This change is 

[codecov]

Codecov Report

Merging #1140 (505e285) into master (0b7e719) will decrease coverage by 1.77%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1140      +/-   ##
==========================================
- Coverage   63.70%   61.92%   -1.78%     
==========================================
  Files         232      230       -2     
  Lines       17043    16604     -439     
==========================================
- Hits        10857    10282     -575     
- Misses       6186     6322     +136     

Flag	Coverage Δ
functionaltests	45.63% <ø> (-1.99%)	⬇️
unittests	43.27% <ø> (-0.87%)	⬇️

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Impacted Files	Coverage Δ
cms/grading/languages/python3_cpython.py	42.85% <0.00%> (-57.15%)	⬇️
cmscommon/commands.py	71.42% <0.00%> (-28.58%)	⬇️
cmscommon/datetime.py	49.05% <0.00%> (-20.65%)	⬇️
cms/service/ProxyService.py	57.44% <0.00%> (-11.75%)	⬇️
cms/server/admin/handlers/contestannouncement.py	36.00% <0.00%> (-10.67%)	⬇️
cms/grading/Job.py	81.04% <0.00%> (-9.87%)	⬇️
cms/service/EvaluationService.py	68.08% <0.00%> (-7.79%)	⬇️
cms/server/admin/handlers/contestquestion.py	26.22% <0.00%> (-7.60%)	⬇️
cms/server/contest/handlers/communication.py	56.00% <0.00%> (-7.34%)	⬇️
cms/db/base.py	85.10% <0.00%> (-6.98%)	⬇️
... and 95 more

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