@george1421 Thank you! This is all i wanted to know 🙂

I have found the answer - hostname was changed after next deploy operation. We can close the topic.

@Sebastian-Roth Thank you!

I did what you suggested (stopped FOG services on client, moved \pl folder to other place and restarted the PC) and after that FOG Client become english-speaking.

English notifications look a way better than with mixed languages.