add translation zh cn

resource/locales/zh_CN/translation.json

@@ -296,7 +296,8 @@
 	"modal_duplicate": {
 		"label": {
 			"Duplicate page": "Duplicate page",
-			"New page name": "New page name",
+      "New page name": "New page name",
+      "Fail to get subordinated pages": "Fail to get subordinated pages",
 			"Current page name": "Current page name",
 			"Duplicate with child": "Duplicate with child"
 		}