Many tks for the translation and the good work. Sorry, but we can't use them, because the languages files are not entities encoded. They have to be with entities to work right in the 2.8.x versions.
In 2.9.0.dev we will be going to find another solution.
Dietmar
I reattach files translated by me, along with default WB2.8.2 PL translation file encoded with entities, and couple minor fixes.
btw. polish translations w/o special chars changed to entities were always working fine in WB.