Updated mediawiki/extensions
Project: mediawiki/extensions/Capiunto  5c6dc4f767deda15f88dbcb598333762647fd91d

Add message documenation

* Fix extension credits array
* Add license to extension credits per file header
* Consistency tweak in description message

Change-Id: I07e0e44768547529dfe71905545b4c49b011e1c6