well, at least on GOG you'll get part of that money back into your account, as regional price compensation, so you can spend it again for other games. Here in Germany, the GOG version is EUR 45 with a EUR 6.80 refund into your account, so effectively you pay EUR 38,20 (~PLN 164). If that's still too expensive for you, then all I can recommend, is to wait.
As for the language... ever since the beginning, they have said they would release the game "in English, with French, German, and Russian subtitles." No other languages were ever promised/announced. If enough people are interested, they might still do a Polish translation, but if they also have to sell the Polish version at massive discounts, then that translation may very well be too expensive and economically unfeasible.
