Fixed some issues in the german Language

For future translation changes in the german language file, just ask me.
Merge pull request #38 from AlexMl/patch-1

Fixed some issues in the german Language
Merge pull request #37 from knezi/master

Fix page transitions
Arranging order of attributes
Update installation instructions
Unmute the sound on info requests
Merge pull request #40 from 316k/master

Unmute the sound on info requests
Change License GNU GPL v2 to GNU GPL v3
Change License GNU GPL v2 to GNU GPL v3
Update instructions for developers