Second batch of pilot sites for Media Viewer

Merge and deploy 2014-04-17, barring any problems.

* Catalan Wikipedia
* Hungarian Wikipedia
* Korean Wikipedia
* English Wikivoyage

https://www.mediawiki.org/wiki/Multimedia/Media_Viewer/Release_Plan#Pilots

Change-Id: I0c36c65bb9f405e03b84d3f6c6b93acda522c5c9