update bilingual

lib/locales/en-US/translation.json

@@ -284,7 +284,9 @@
   
      "customize_page": { 
        "Behavior": "Behavior",
-       "Layout": "Layout"
+       "Layout": "Layout",
+        "Function": "Function",
+        "function_choose": "You can choose Valid/Invalid of the function"
 
  }
 }