Add tests to TranslationDeleter

[codecov-commenter]

Codecov Report

Merging #446 (4701d10) into main (2f79f1a) will increase coverage by 0.60%. The diff coverage is 95.45%.

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@@            Coverage Diff             @@
##             main     #446      +/-   ##
==========================================
+ Coverage   85.22%   85.82%   +0.60%     
==========================================
  Files         190      191       +1     
  Lines        6986     7064      +78     
==========================================
+ Hits         5954     6063     +109     
+ Misses       1032     1001      -31     

Impacted Files	Coverage Δ
...TranslationService/TranslationNetworkManager.swift	100.00% <ø> (ø)
...tionServiceTests/TranslationsRepositoryTests.swift	74.46% <50.00%> (-0.54%)	:arrow_down:
...nslationServiceTests/TranslationDeleterTests.swift	97.36% <97.36%> (ø)
...ources/SystemDependenciesFake/FileSystemFake.swift	96.77% <100.00%> (+0.10%)	:arrow_up:
...ationService/SelectedTranslationsPreferences.swift	100.00% <100.00%> (ø)
...ources/TranslationService/TranslationDeleter.swift	100.00% <100.00%> (+100.00%)	:arrow_up:

... and 4 files with indirect coverage changes