Remove cyrillic symbols from tests

[G1gg1L3s]

Ukrainization is good, but only on the battlefield and during destruction of the rashists :)

I've configured my code editor to highlight the cyrillic symbols, so it shouldn't happen anymore...

Checklist

• [x] ~Change is covered by automated tests~
• [x] ~The coding guidelines are followed~
• [x] ~Public API has proper documentation in the Acra documentation site or has PR on documentation repository with new changes~
• [x] ~CHANGELOG.md is updated (in case of notable or breaking changes)~
• [x] ~CHANGELOG_DEV.md is updated~
• [x] ~Benchmark results are attached (if applicable)~
• [x] ~Example projects and code samples are up-to-date (in case of API changes)~

[vixentael]

you can't imagine how many bugs i've created because i use cyrillic "с" letter. some languages, like swift, allow using cyrillics which makes ~coding more fun~ bugs more crazy.

[G1gg1L3s]

I'm confused about the failing tests :confused: