revert 637359a and manually merge pull request #1232

Signed-off-by: Juergen E. Fischer <jef@norbit.de>
german translation update
[TRANSUP] String update on demand

Signed-off-by: Werner Macho <werner.macho@gmail.com>
[TRANSUP] nb by James

Signed-off-by: Werner Macho <werner.macho@gmail.com>
use Shift modifier for bigger step when changing brightness/contrast
(fix #8177)
apply brightness/contrast changes to all selected layers (fix #8176)
[TRANSUP] fi by Kari

Signed-off-by: Werner Macho <werner.macho@gmail.com>
[processing] fix Distance Matrix tool (fix #7618)
fix #9838
[processing] fix wrong tools description (fix #9852)
Add render checker color tolerance to sip
Add render checker color tolerance to labeling tests
Fix labeling local server test class setup error
Add PDF composer output labeling tests setup