UC-70 Messaging changes

* Changed message key prefixes from facebookclient- to fbconnect-
* Copied over all messages from FBConnect extension to FacebookClient
* Fixed some wfMessage uses without an output format
* Added some (but not all) qqq
UC-70 Get rid of unused messages.
Merge pull request #5249 from Wikia/UC-70

UC-70 Messaging changes