Improved German translation for 3.0.0

Improved the existing translation for 3.0.0 to make it look and sound more natural. also corrected some minor typos
Merge pull request #691 from Minty123/patch-6

Improved German translation for 3.0.0
Update strings.xml
Merge pull request #693 from pesa1234/patch-42

Update ITstrings.xml kk
ModVolumePanel: fixed volume key crashes on Xperia devices
ClearAllRecents: force recents activity to finish when idle
When another app is launched from navbar ring or quick settings (or
whatever other way), recents activity will end up in a paused state
which prevents recents key from working correctly next time it's
pressed. We force finish of recents activity in case it was not resumed
in specified amount of time (500ms).
This also fixes stuck clear all navbar key - it will go away when finish
runnable is fired
ClearAllRecents: optimizations
Recents panel: Clear all in navigation bar / pie
Fixed icon coloring in pie
Set clear all icon alpha to better match AOSP icons
Merge branch 'kitkat' of https://github.com/GravityBox/GravityBox into kitkat