VE-389: set up initial panel layout for the media insertion tool.
Merge branch 've-sprint-4' into VE-389
VE-389: implement PagedLayout inside the MediaInsertionDialog.
VE-389: udpate CSS to match new DOM structure.
Merge pull request #1683 from Wikia/VE-389

VE-389: implement panel layout for the media insertion dialog
Video (vid-911): VideoPageTool - update publish date
VID-790 adding breadcrumbs to the top of the video page admin form
removing unused code
Localisation updates from http://translatewiki.net.
VID-917 fixing scroll bar on video home page
removing unnecessary semicolons
Merge branch 'VE-391' into ve-sprint-4
Revert "Merge branch 'VE-391' into ve-sprint-4"

This reverts commit 369447a97479f8af826211cfbe5b40ffa021beca, reversing
changes made to 5f559a1ccd352c97c9ab189be0d62b08289782f8.
VE-391: create WikiaMediaSearchWidget (from MWMediaSearchWidget).
VE-391: add widget to resource loader.