fix: iframes javascript content (#2218)

public/locales/en/widgets/error-boundary.json

@@ -7,8 +7,8 @@
     }
   },
   "modal": {
-    "text": "",
-    "label": "Your error",
-    "reportButton": "Report this error"
+    "text": "The widet crashed unexpectitly. Please read the documentation and fix any typos.",
+    "label": "Occurred error",
+    "reportButton": "Report this error on GitHub"
   }
 }