It's not that I can't find a Polish translator. I decided not to add the translation (same with a number of other languages that I have left out).
These translation take a lot of time for both me and the translator, there is a lot a of communicating back and forth.
Of all my (paying) customers, less than 1% is Polish.
And sadly, I can't pay my bills with gratitude.
Thanks a lot for your feedback. Actually all of the things you pointed out are discussed in the current poll:
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These will all be addressed in the next update or the one after that.