Fix translation errors

[maciejla]

Fixed (at least some) translation errors. I'm sure there are still some left, but I don't have enough time right now :(
Will do when I have some more time :D

[mkinney]

Thanks! Much appreciated.

[codecov]

Codecov Report

Merging #157 (5eef62b) into master (23d2512) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #157   +/-   ##
=======================================
  Coverage   58.47%   58.47%           
=======================================
  Files          26       26           
  Lines        3234     3234           
=======================================
  Hits         1891     1891           
  Misses       1343     1343           

Flag	Coverage Δ
unittests	58.47% <ø> (ø)

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[mkinney]

Thanks!