Update French translation

* manual/index.xml.fr: new file

Translated by: "Vincent Deffontaines" <vincent gryzor.com>
Reviewed by: alain B <chbok hotmail.com>


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.0.x@154503 13f79535-47bb-0310-9956-ffa450edef68