related to #1461 Adding natural sort order ASC and DESC

admin/cat_move.php

@@ -30,7 +30,9 @@ $sort_orders = array(
   'date_creation DESC',
   'date_creation ASC',
   'date_available DESC',
-  'date_available ASC'
+  'date_available ASC',
+  'natural_order DESC',
+  'natural_order ASC'
 );
 
 if (isset($_POST['simpleAutoOrder']) || isset($_POST['recursiveAutoOrder']) )
@@ -98,7 +100,7 @@ SELECT id, name, id_uppercat
 
   array_multisort(
     $sort,
-    SORT_REGULAR,
+    $order_by_field === "natural_order" ? SORT_NATURAL : SORT_REGULAR,
     'ASC' == $order_by_asc ? SORT_ASC : SORT_DESC,
     $categories
     );