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
Merge "Switching to JCObjContent"