Qual: moved mobiledetect external library

External libraries resides in the include directory

htdocs/core/lib/functions.lib.php

@@ -139,7 +139,7 @@ function getEntity($element=false, $shared=0)
  */
 function getBrowserInfo($user_agent)
 {
-	include_once DOL_DOCUMENT_ROOT.'/core/class/mobiledetect.class.php';
+	include_once DOL_DOCUMENT_ROOT.'/includes/mobiledetect/mobiledetect.class.php';
 
 	$name='unknown';
 	$version='';