Updated mediawiki/extensions
Project: mediawiki/extensions/BlueSpiceExtensions  3a497d9693c81cc58d00073fd2fd054ce4efb587

Implemented changes for translatewiki

Moved to Json i18n files
Improved english extension description
Added missing message in german

Change-Id: I745d9ec16afc71a4bd6253812cf71684ace87424