update demo campaign

fixed typos and translate some untranslated parts
translation 0.9.0

first part of the translation for version 0.9
translation 0.9.0

seconde part of the translation for version 0.9
translation 0.9.0

finished to update all new keys and delete all unneeded keys.
translation is ongoing.
translation 0.9.3

finished to update all new keys and delete unneeded keys. translation is
ongoing.
Merge pull request #13 from Tardan/master

german translation update for 0.9.3