German Translation

Thanks for your efforts!
However, some phrases did not properly match the original statements.
Although I know that "administer" is always translated to "verwalten" in Drupal core, I do not like this translation for Admin Menu. Since both terms are possible, I prefer to keep the translation as close as possible to the original, so the module and block are not at completely different positions in listings.
I have committed a new translation, partially based on yours.