This updates the german translation file to Roundup version 1.4.2.

A lot of translations were missing; there were some minor typos. 

I tried to be as diff-friendly as possible, comparing to the POT file. Some translations were re-arranged to match the given order. Some msgids stayed the same but look different now due to linebreaks; they were updated to the notation used in the POT file. Some old msgids and their translations were preserved when used in tracker templates.