add missing i18n lookups

[lukaszett]

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When working on an international project, I noticed that some calls to gettext_lazy are missing. This PR aims to fix that issue.

Perhaps this would also be the place to discuss whether it makes sense to offer translations in the repo. But I understand if the effort would be too great.

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (15ffd45) to head (45715b5).

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Additional details and impacted files

@@            Coverage Diff            @@
##            master      #269   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           24        24           
  Lines          635       634    -1     
=========================================
- Hits           635       634    -1     

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