Update German translation: add missing strings, improve wording in a few phrases and some cosmetic changes (whitespace and consistent case). Taken from FS#9754 but leaving out some changes which that didn't feel right to me for the moment. Add Johannes Linke to the credits for his work.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@20266 a1c6a512-1295-4272-9138-f99709370657
2 files changed