Video (vid-501): show error message if wgAllowNonPremiumVideos is false when adding non premium videos
Video (vid-501): WikiaVideoAdd - show error message if wgAllowNonPremiumVideos is false when adding non premium videos
Merge pull request #1051 from Wikia/vid-501

VID-501: Error messages for when users try to add non-premium video to a premium video only wiki