I am posting this already since a year, but obviously without any success:
The translated GUI elements make problems because their accelerator keys (short cuts) never have been adapted, just two examples:
1) the menu entry "Extras" has been coded as "&Extras" instead of "Ex&tras" so the short cut Alt-E does not work (because of the additional "B&earbeiten" entry in the menu)
2) when opening the preferences dialog for songs, the picture tab can't be chosen by using a shortcut. The tab has been coded as "&Album-Bilder" (instead of "Album-&Bilder"), but Alt-A activates the button "Abbrechen" (what means exiting the dialog)
Maybe it will be possible to integrate such simple things in the next translations!