Bug 10050: Update German web installer files for 3.12 - Mandatory

Bug 10050: Update German web installer files for 3.12 - Mandatory

This patch updates the German web installer files from the
mandatory directory.

This includes:
- CalendarFirstDayOfWeek defaults to Monday
- gist rates default to 0.07|0.19|0.00
- RoutlingListNote default text translation
- uniqueitemfields default set to barcode stocknumber
- Translation of new user flags and permissions
- Corrections to existing translations and typo corrections

To test:
- Run the web installer with German installed
- Verify all mandatory SQL files are installed correctly

Note: The German po files in master are buggy, please
use files from translate.koha-community.org for testing.

Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>