Last modified: 2008-12-20 01:06:28 UTC
By default, searches on Commons cover the '(Gallery)', 'File', 'Help', 'Category' and 'MediaWiki talk' namespaces. 'MediaWiki talk' shouldn't be on that list, I can't think of any cases where users trying to search for media files would be interested in discussions about interface messages.
Probably got put in by accident aiming for something else.