#587706 by dalin: Fixed language_initialize() needs to clean up ['q'] just...

#587706 by dalin: Fixed language_initialize() needs to clean up ['q'] just like drupal_path_initialize() does.

includes/language.inc

@@ -342,7 +342,7 @@ function language_from_default() {
  *    - The path without the prefix on success, the given path otherwise.
  */
 function language_url_split_prefix($path, $languages) {
-  $args = empty($path) ? array() : explode('/', $path);
+  $args = empty($path) ? array() : explode('/', trim($path, '/'));
   $prefix = array_shift($args);
 
   // Search prefix within enabled languages.