Hi @mhautala
I am sorry bout the late reply to your post!
Indeed, localization for email templated is quite limited, being available only through liquid syntax. It would be a great function to allow the custom email providers to handle the localization of emails or have an option inside the Auth0 dashboard to allow localization settings.
I would suggest to post on our Feedback page regarding a potential use case and implementation for this.
If you have any other questions, feel free to let me know!
Kind Regards,
Nik