Hey Bawolff,
Including mediawiki.jqueryMsg fixed the issue. Thanks a bunch!
I concur this is rather peculiar design. It'd be helpful to have some indication of this in the method docs of the mw.msg() code.
Cheers
-- Jeroen De Dauw | www.EntropyWins.wtf https://EntropyWins.wtf | www.Professional.Wiki https://Professional.Wiki Entrepreneur | Software Crafter | Speaker | Open Souce and Wikimedia contributor ~=[,,_,,]:3