The Gentoo ebuild www-apps/mediawiki adds a section at the end of the configuration file LocalSettings.php that contains a few additional settings to restrict Mediawiki access. In the comments for this section there is a line that reads "Here I make the very gross assumtion that everyone will install in english 1st. assumtion --> assumption english --> English Reproducible: Always
http://overlays.gentoo.org/svn/proj/webapps/migration/www-apps/mediawiki/ Will be in CVS for Bug 207757.