Updated mediawiki/extensions
Project: mediawiki/extensions/BlueSpiceExtensions  4c70297509889ef86276aad6e188005f4e06b833

added multiselect + bugfixes

* added support for multiselect
* added new i18n keys for dialog
* fixed some bugs when displaying the error message
* dialog now doesnt close anymore when error occurres, setloading instead
* small change to api
* updated qqq

Change-Id: Iaaa3b65bfb3a12b3778db1898ce599d35df7a863