Added German Translations for the Docs

Hey there!
I added the German translations for the Sponge Docs (Wiki) to the /source/locale/de/LC_MESSAGES/ folder.
I'm sorry but I didn't inform you that I wanted to do so (on forums or something like that) but I hope that I can help you with that.
I think that a German translation is neccessary because many people running a Minecraftserver and playing Minecraft are from Germany (like many statistics say) and some of them are to young to understand english as it's used in the docs. So it was a goal for me to translate the docs into German so that every little German kid could start a Sponge Powered Server.