Thanks to nonntann, DURF is now available in Japanese! You can find it here :)

Other languages available besides English and Japanese:

• 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
  

Cheers!

Emiel