FUTURE: Fifth batch of pilot sites for Media Viewer

Merge and deploy 2014-05-08, barring any problems.

* Japanese Wikipedia
* Portuguese Wikipedia
* Spanish Wikipedia
* Swedish Wikipedia

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

Change-Id: I11e5ca294eede69d20c3ff974a8b44579acbdce0
Merge "FUTURE: Fifth batch of pilot sites for Media Viewer"