Add German translation

[RobYed]

Thanks for this awesome app! I just started using it regularly, so I created a German translation.

Unfortunately I saw that there already exists a PR for a German tranlation right after I created it. In this other PR someone made some justified remarks. My translation fixes those and is based on the newest develop version. Feel free to use it.

Would be glad if I could also help with other improvements of the app. Let me know if you need any help.

[Xandorion]

How to use the translation? Is there an Option in the app or must i build the apk?

Kann man deine version mit der übersetzung hier runterladen oder müsste man diese selbst erstellen?

[RobYed]

@Oopsiedai I think the language is set based on the os settings. You would need to build the app by yourself if you want to use it.