Hi,
First of all, I don't speak Deutsche. I'm working on the Spanish translation (the one included in 1.6.0.0 was not 100% complete yet, now I have finished) and I have taken a look at your language file. I see that you have done a lot of work, there are hundreds of words to translate and it's not easy to fit them in the available width
.
I have seen that your language file is not XML compliant, there are some small mistakes that you should correct. To do that, open the file with Internet Explorer 6 or Netscape 7 (for instance) and any of them will tell you all the errors (one at the time, unfortunately).
Also it is possible to translate column headers of many windows (but not all of them). If you want take a look at my language file, just before the definition of the Start page of Shareaza. There is a section called <listColumns>.