Updated mediawiki/extensions
Project: mediawiki/extensions/BlueSpiceExtensions  741909ac4b342df4b468a30ecef1f88c8783df90

Implemented changes for getting into translatewiki

Migrate to JSON i18n
Fixed path to i18n folder
Changed keys to lowercase

Change-Id: I9c779887f27b90ca09330155bef3ce81352beec1