Hi Seba,
Your translation is not bad, but you have maked a few mistakes.
First, many of the strings is too long (don't match exact fields).
Second, you don't use properly specific "polish graphical slang" (it is most
visible in blend modes translation)
IMO I think, that my translation is a bit better. We can together translate
the documentation if you want
Regards
Damian Grocholski