Some of the methods used for mw.message were incorrect, which could
potentially lead to double escaping.
This follows up I4bc60570012bcd8eab5ad32c5004d06b3af42798
Change-Id: Iceb819c8fa6c46c234fc79d1c81bd3252440269c
The WikiEditor extension has a button and some help text that
is only applicable if the Cite extension is enabled. Move
that (with some modifications) to the Cite extension instead.
Bug: T339973
Depends-On: I8256660f9c6886d6764b45735284e00308fc56e5
Change-Id: Ib3fdc897dd3330f69c5832003d4c3cb1e6dba2f3