Update to German locale [de]

[adriaanb]

Hello,

I've taken some time to complete the missing strings for the German localization.
Please find my suggested translations in the file attached.

Hope it's helpful :)

de.txt

[paulrouget]

Awesome! Thank you :) will be part of 9.0.1.25! ❤️

[Xetobal]

Here are some more translations. Hope it's helpful as well
de.txt

[paulrouget]

Sorry for the late reply. This will be in v9.1.