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LEGO Harry Potter: Years 1-4 support Polish and Russian language but these options is not available from language_setup.
To add this unpack archive to main game folder (also eula and readme docs in Polish language included):
https://drive.google.com/open?id=1da1tm6MpaV7J17Kg83VgvFAoFg7ik332

or replace content of language_setup.ini with this:
https://pastebin.com/NQEgA9pq