Thanks to Bernard Abramowicz, DURF  is now available in Polish! You can find it here :)

Other languages available besides English and Polish:

• Italian by Francesco Catenacci (can be downloaded on the main page) 
• French by Louis-Philippe Breton (can also be downloaded on the main page) 
• Spanish by Arturo Purroy
• German by Birger Lambrecht
• Portuguese (Brazilian) by Mikaela Morais Dias
• Japanese by nonntann
• Russian by Dmitry Pavlov

Cheers!

Emiel