Clicking 'Review link' highlights the relevant wikitext in the editor.

This is behind the DisambiguatorNotifications feature flag.

Compatibility with CodeMirror and the 2017 wikitext editors can be
addressed in separate patches.

Bump version to 1.4

Bug: T285508
Change-Id: Id6a03c60ab9805fda978b33f6cc1f29b748fcce6