EDIT:
Solved.
For graphical apps:
Create .profile file in guest or root, then add
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export LANG=pl_PL.utf8
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echo "export LANG=pl_PL.utf8" >> $HOME/.profile
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echo "source ~/.profile">>~/.bashrc
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export LANG=pl_PL.utf8
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echo "export LANG=pl_PL.utf8" >> $HOME/.profile
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echo "source ~/.profile">>~/.bashrc