Updated mediawiki/extensions
Project: mediawiki/extensions/BlueSpiceExtensions  8a7c7b13291ba99e65db6b67ea832b7533864154

Implemented changes for translatewiki

Moved php i18n file into languages folder
Moved to Json i18n files
Removed unused in message in german
Added PLURAL support to message
Fixed typo
Improved message removed superfluous word

Change-Id: I20b9ae3e3a297d88a68cc1aa35588cbe9f6efd40