Checks available language codes of Template:Languages to set xml:lang dynamically
Currently xml:lang is set by $wgContentLang only. It's not good to search engines to determine the real content language of a specific page.
The patch checks available language codes of Template:Languages to set xml:lang dynamically. It's particularly important to http://wikimania2007.wikimedia.org or other sites used Template:Language.
attachment Setup.php.diff ignored as obsolete