Story 1685: Improve red links support in Beta

* Make sure anonymous users don't see redlinks
* Change pre-filled editor text for new pages
* Add confirmation step at save of new page
* Add toast message for successful page creation
* Remove redundant setting of isNewEditor in child class

Change-Id: I69a5326196259ec894053e8df8b8c5a60355de2a
Merge "Story 1685: Improve red links support in Beta"