handle_multi() was not setting content_language.

Submitted by: Petr Lampa <lampa@fee.vutbr.cz>
Reviewed by: Paul Sutton, Marc Slemko, Dean Gaudet


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@77574 13f79535-47bb-0310-9956-ffa450edef68