Hey,
The reason there's no answer could perhaps be that this isn't suppose to be a Joomla or VirtueMart support site. There are some very cool guys over there that can help with the basics.
Regarding the language problem, I see that you also use special characters as I do so make sure that you save the file as UTF-8 or UTF-8 NO BOM when you are editing VirtueMart files. See also this post heres:
96-yourshop/85253-module-image-show-modgkimageshow-.html
Furthermore if you translate the file and save it as explained above you should ensure that the user you are testing with has German selected as his primary language inside Joomla, otherwise it will default to english.
Hope this helps!