Update and complete German translation and fix mistakes

[Wuzzy2]

This PR updates the German translation, completes it (100% translated) and fixes some grammatical and typographical mistakes.

[PilzAdam]

No other translator is listed here...

[Wuzzy2]

Automatically generated by Virtaal, sorry.

[BlockMen]

Please update, especially revert the dots "..."
Concerning the hyphenation, either "Mod Informationen" or "Mod-Informationen", but not "Modinformationen".

[Wuzzy2]

Oh, BlockMen …

• “Mod Informationen”, “Online Mod Archiv”, “Mod Archiv”: All wrong, this is the Deppenleerzeichen. https://de.wikipedia.org/wiki/Leerzeichen_in_Komposita
• You might however argue for “Mod-Informationen” over “Modinformationen”. But at the end of the day, this is not much of a difference.
• Using the “ASCII quote” as quotation marks: Sorry, this is simply wrong in German, and your personal preference is not going to change that. How is clearness even an argument here? Either „…“ or »…«, but not "…". The only valid counter-argument would be valid character encoding or font concerns.
• What's wrong with the ellipsis character, anyways? Are there real (not just maybe) encoding or font problems?

Anyways, this PR is now really outdated and messy. A couple of new strings have been added lately. So I guess I just throw this PR away and start over, considering the reasonable comments this time.