FAIR is a non-profit organization dedicated to providing well-documented answers to criticisms of the doctrine, practice, and history of The Church of Jesus Christ of Latter-day Saints.
MediaWiki:Apihelp-query+allmessages-param-includelocal
Also include local messages, i.e. messages that don't exist in the software but do exist as a MediaWiki: page. This lists all MediaWiki: pages, so it will also list those that aren't really messages such as Common.js.