Add password challenge to 2FA settings, e-mail notifications (#11878)

Fix #3961

app/javascript/styles/mastodon/forms.scss

@@ -254,6 +254,10 @@ code {
       &-6 {
         max-width: 50%;
       }
+
+      .actions {
+        margin-top: 27px;
+      }
     }
 
     .fields-group:last-child,