Lightbulb: DE translation

PS1: DE translation
PS2: fix "zum Ausschalten"   thx Markus Hoeber

Change-Id: I11c9a00549d9771b32d73b40839c61ab794eac7c
Signed-off-by: Matthias Freund <matthias88freund@gmail.com>
Merge "Lightbulb: DE translation" into kitkat