Includes JS to sneakily change the default message if the user changes the filter group without having selected the "warn" action yet.
Change-Id: Ic753c3e018321dba3bf9f6d7bcee10a49c9faac8
* Tested AbuseFilter.
* Did not test ArticleCreationWorkflow, Configure, ContributionTracking, FlaggedRevs, FundraiserPortal, InlineCategorizer, MarkAsHelpful, Math/Mathjax.
* Fixed a typo in a comment in LiveTranslate.
* Did not review extensions alphabetically after MoodBar.