According to
https://firebase.google.com/docs/auth/web/email-link-auth#default-email
and
https://github.com/firebase/firebase-js-sdk/issues/2574
The email sign in template contains a timestamp in the email title and body, so email are not collapsed into a sigle thread.

I believe the current date time format, such as 2024 November 11 13:33 UTC is not user friendly, and should be replaced with a more readable format, such as Nov. 11, 2024, 11:33.

The mail language is already based on the language set in the Firebase Authentication -> Template language section, so the formatting can be done based on the same setting, or a new option can be added in the Firebase Console to select a format.