Commons should have a C or COM prefix redirecting to Commons, equivalent to the Wikipedia prefix WP. For instance:
http://en.wikipedia.org/wiki/WP:Image_copyright_tags goes to:
http://en.wikipedia.org/wiki/Wikipedia:Image_copyright_tags
http://commons.wikimedia.org/wiki/COM:Copyright_tags or
http://commons.wikimedia.org/wiki/C:Copyright_tags should go to:
http://commons.wikimedia.org/wiki/Commons:Copyright_tags
Version: unspecified
Severity: enhancement