[x2go-i18n] German x2goclient translation for release 3.99.2.0

[Stefan Baur]

...is in

fylgja.das-netzwerkteam.de:/home/stefan/x2go/x2goclient/x2goclient_de.ts

@Mike: please test it and look for obvious errors.
Since you're probably planning to release today, fixing all the errors I 
ran into when trying to build a test copy of x2goclient on fylgia will 
probably not be possible in time, so you should talk me through the 
necessary procedures some time after the upcoming release. Since this is 
probably machine-specific, I'll send you the error messages off-list.

Also, please note that I didn't have a chance to update the "English to 
English" translation yet, and probably won't be able to do so in time 
for 3.99.2.0.

I am offering to do the grunt work there, though - i.e. fixing the 
obvious errors, so we will only need a native speaker for the final checks.

Sadly, John A. Sullivan III is not available for this task (I had asked 
him off-list and he politely declined, due to lack of time).

-Stefan