Updated mediawiki/extensions
Project: mediawiki/extensions/BlueSpiceExtensions  a505f469c1887ceef1861e53422f87bb8b5c9bbb

i18n: make extension descriptions translatable

- Replace extension descriptions by wfMessage() call
- Sync them with en.json
- Replace single-quotation by double-quotation
- Replace "article" by "page"

Change-Id: Iadde21cbadd0dcc11dde2d753bb7cceafe4b4974