@amyfox
I'm sorry to hear you find this as badly translated, but since you've found a lot of wrongly translated words, maybe it's true. I have never claimed to be infallible, so I do not deny it. At the same time, I admire your commitment as I suspect that this must have required some skills and it took some time to judge the quality of this translation.
If you want to go into details, feel free to start a thread in the Icewind Dale section, on the Polish forum dedicated to Infinity Engine games:
http://athkatla.cob-bg.pl/viewforum.php?f=10&sid=5f010b4972b4bb7aaf2c0ea2b1968f85Your comments (even partial) may prove valuable in a case that someone undertakes to correct this translation. (Probably not me, because such a self-correction would be rather ineffective).
Well, thanks for the feedback anyway. And I also hope that someone will someday translate the IWD2 NPC mod into Polish.