Last modified: 2014-03-18 17:05:54 UTC
The code for this extension predates Daniel K.'s work on ContentHandler in core, and as a result its approach to content-types is archaic and ad-hoc. Rather than check the file extension and then give up, it should instead rely on the interface exposed by ContentHandler and ContentModel classes.
Change 104721 had a related patch set uploaded by TheDJ: ContentModel: Use CM to choose CE language https://gerrit.wikimedia.org/r/104721
Slightly related: CM for Scribunto https://bugzilla.wikimedia.org/59160
Change 104721 merged by jenkins-bot: Use page ContentModel to choose editor language https://gerrit.wikimedia.org/r/104721
Patch was merged a while ago - is there more work left to do here (if yes: please reset the bug report status to NEW or ASSIGNED), or can you close this ticket as RESOLVED FIXED?