Hi @loop28
Thanks for your intention to help translate in german. 
By the way: thanks for compliments at my side, but I had translate nothing for Welcome application, so I have to give back the compliment. 
I wanted to help translate, but had same case as @h2f has had with transflex:
https://ubuntu-mate.community/t/german-speaking-proof-readers-please-line-up/4524/9?u=atreju
But German is my native tangue as well, so I’m helping @wolfman by translate the Installation-Wiki:
https://ubuntu-mate.community/t/komplette-ubuntu-installation-fur-anfanger/6168?u=atreju
You are warmly invited to help us, if you like.
Best regards
Atreju