new: setting of editor highlight

lib/l10n/app_en.arb

@@ -62,6 +62,7 @@
   "edit": "Edit",
   "editVirtKeys": "Edit virtual keys",
   "editor": "Editor",
+  "editorHighlightTip": "The current code highlighting performance is worse and can be optionally turned off to improve.",
   "encode": "Encode",
   "error": "Error",
   "exampleName": "Example name",
@@ -87,6 +88,7 @@
   "gettingToken": "Getting token...",
   "goBackQ": "Go back?",
   "goto": "Go to",
+  "highlight": "Code highlight",
   "homeWidgetUrlConfig": "Config home widget url",
   "host": "Host",
   "httpFailedWithCode": "request failed, status code: {code}",