simplified mail settings ui

ui/package.json

@@ -14,6 +14,8 @@
   "devDependencies": {
     "@codemirror/autocomplete": "^6.0.0",
     "@codemirror/commands": "^6.0.0",
+    "@codemirror/lang-html": "^6.1.0",
+    "@codemirror/lang-javascript": "^6.0.2",
     "@codemirror/language": "^6.0.0",
     "@codemirror/legacy-modes": "^6.0.0",
     "@codemirror/search": "^6.0.0",