Updated mediawiki/extensions
Project: mediawiki/extensions/BlueSpiceExtensions  3cf3e9629500239a64e1d84ec4f6f4b703e96493

Added missing I18N

THIS IS A MANUAL MERGE FROM REL1_22
https://gerrit.wikimedia.org/r/#/c/169332/

And fixed one I18N key to meet conventions

 * Added german formal version

Change-Id: I046e280cddc49b8913ca472846fe7f7bd695f06c