Link to mediawiki.org in a message
Fragment of a discussion from Support/LiquidThreads
The namespace prefixe "MediaWiki:" is where translated messages are loaded on all wikis using MetaWiki. It is not goring to Mediawiki.org. You make a confusion with the "mw:" interwiki prefix (and anyway, that prefix is usually not used: when a message needs to reference the MediaWiki.org website, it uses a plain URL (This is generally limited to a few links for shwoing the documentation of Mediawiki or getting support for it).