Updated mediawiki/extensions
Project: mediawiki/extensions/ZeroBanner  d9cad31f2aee146ecf6b601f5673c0e852fc600c

Switching to JCObjContent

* Renamed zero-config-lang_name_overrides i18n msg
* Config array is now an object
* Moved default text to ZeroPortal's view
* Lots of minor refactorings matching with JsonConfig

Change-Id: Ie3b3d93b381ee92ae0445d79d7ad154c548a6585