@guenter: This is not Polish language, but old Slavic language of some region in Poland difficultly to understand in others regions. Mabe you know kow many differents can be in others regions on the same country
There is old translation, but too old for this version:
http://kmeleon.sourceforge.net/resources/translations.php
I was find:
http://www.tcbmi.com/cgi-bin/translate?lang=Polish
It's look like translation forms for KM 0.9.x
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Sorry for my english