fix du problmeme de route pour index (où la locale n'était pas fournis)

src/Muzich/IndexBundle/Resources/config/routing.yml

     pattern:  /hello/{_locale}
     defaults:
       _controller: MuzichIndexBundle:Index:index
+      _locale:     ''
 
 fos_user_security:
     resource: "@FOSUserBundle/Resources/config/routing/security.xml"