German translation of missing strings

[DrMarkus]

de.txt

[beaggu]

de.txt
Improved translation

[nutcrapper]

de.txt

Very good! Although you both got that part with the CoApp kinda wrong. I fixed that to "Mit Begleitanwendung und erweiterten Downloads fortfahren" and "Mit einfachen Downloads fortfahren" in my take:
de.txt

[Preschoolstudent]

Here is an update for some missing translations in the german version
de.txt

It's the first time for me helping here on github. Hopefully, I have made everything right - if not, please, give me an advice how to made it better.

[RLeilich]

de.txt