I have already solved the problem with the missing texts. I compared the English translation with the Slovak one and found out that they have different markings. While in the English markings there are only numbers, in the Slovak translation there is admins_ before the numerical markings. So I did a simple thing. In the Slovak version of the translation, I simply deleted admins_ in front of each translation and it works. I am attaching a screenshot as an example.
But now I'm struggling with another problem. It does not show the Slovak flag on the page when switching languages. The image does not load. As if it wasn't even uploaded. But he is on FTP. But the site has a problem reading it.
... and excuse my unprofessional expressions. I'm not a programmer.