Updated mediawiki/extensions
Project: mediawiki/extensions/BlueSpiceFoundation  dbba9df823ea90f579f32dc3296d450aa9743075

Adding BlueSpice installer overrides for MW installer

Adding all necessary override classes for automatic BlueSpice
installation. Also Added i18n for installer

Added check if ne file or folder already exists that it cannot be
overwritten
Removed test renaming
Improved message
Reduced redundant code

Change-Id: Ie45fa018828226f384f0120fec8e15f4e010fa1e