Translations updated

Hi,

I've updated the translations, added a few (incomplete) translations
and added more unittests for the translations. The total is now +/-
17750. This helped finding about 70 issues with the current
translations (%2 instead of %s, \t Ctrl+S instead of \tCtrl+S, stuff
like that). Hopefully I can find enough time tomorrow to do the
release.

Cheers, Frank