set subpageTitle equal to tabs title - it's currently valid for en, de, fr and es wiki
MAIN-139: Fix for creating all Chinese wiki in 'zh', despite currently used Chinese language variant.
make more readable
mov squash into separate function
VID-383 Blocked uses can add video via <youtube> tags
VID-383 Use $app rather than $this
DAR-735 Removed '?redirect=no'
It is no longer needed after changing of default landing page
Update some docs, fix an "index not found" error and adjust syntax to current guidlines
Merge pull request #989 from Wikia/VideoSprint27-VID-383-BlockedUsersAddVideo

Video sprint27 vid 383 blocked users add video
DAR-735 Flattening of wikis for Collections

- added getPromotionCondition method to WikiListConditioner interface
- used implementation of getPromotionCondition to flatten wiki list for Collection
- added unit test for getPromotionCondition implementation in WikiListConditionerForCollection
DAR-735 Changed assertion message in unit test
DAR-749 | WAM - copy change
Merge branch 'dev' into MAIN-139
DAR-741 Disabling the possibility to add wiki without image to a collection

Added status to the response from controller when a request is made
to add a wiki to a collection.
Added processing of that message on the client side to reflect
the actual status of the adding operation
DAR-741 UI consistency fixes

Replaced alerts with modals
Merge branch 'dev' into dar-sprint-11
DAR-741 spacing issues
DAR-741 Mediawiki cc reformatting
Merge branch 'dev' into CON-84
initial version of modal box for closing thread