support don't export tree

public/locales/en.json

@@ -71,6 +71,7 @@
   "tree.overview": "Overview",
   "tree.name": "Tree name",
   "tree.desc": "Tree desc",
+  "tree.export": "Export",
 
   "regnode.input": "Input: ",
   "regnode.output": "Output: ",

public/locales/zh.json

@@ -71,6 +71,7 @@
   "tree.overview": "概况",
   "tree.name": "行为树",
   "tree.desc": "说明",
+  "tree.export": "导出",
 
   "regnode.input": "输入：",
   "regnode.output": "输出：",