Add 'Save and stay' button on missing pages at back office

controllers/admin/AdminMetaController.php

@@ -381,7 +381,16 @@ class AdminMetaControllerCore extends AdminController
             ),
             'submit' => array(
                 'title' => $this->l('Save')
-            )
+            ),
+            'buttons' => array(
+                'save-and-stay' => array(
+                    'title' => $this->l('Save and stay'),
+                    'name' => 'submitAdd'.$this->table.'AndStay',
+                    'type' => 'submit',
+                    'class' => 'btn btn-default pull-right',
+                    'icon' => 'process-icon-save',
+                ),
+            ),
         );
         return parent::renderForm();
     }