The en-jp dictionary is hardly useable because
1) If you enter less than three japanese characters the app prints "expression too short". There are loads of japanese words with only one or two characters!
2) The app doesn't look for spelling in hiragana. Only the first dictionary entry (with kanji) is found.

If the above is fixed, I would like to see a de-jp dictionary. Can you include wadoku?
http://www.wadoku.de/wiki/display/WA...oads+und+Links