I can't change language in Zorin OS 15

I have a problem with changing language in Zorin OS 15.
When i change language to polish and click apply to system wide in my language “zastosuj dla całego systemu” nothing happens.
When i log out i have something in polish and smoething in english

I am sorry for applying redundancy, but could you please double check all the steps you took in applying your language?

Just to be certain.

Yes, I have done all the steps and still nothing has changed

some elements in Polish and some in English

Try reinstalling language-selector-gnome in Synaptic.