On a wiki with thousands of users and an edit that affects thousands
of pages, ReplaceText should be able to make mass changes wihout
sending out a bunch of emails (which would then result in a bunch of
complaints from fairly active users with a long watchlist).
This adds a checkbox to disable emails. This is done by telling
MediaWiki not to update the RecentChanges page since email
notifications are sent when the RC page is updated.
Bug: T177291
Change-Id: I119506e697a7f8e6bdda92183c098a2e733d6d3d
