Module
Which account email to write. Each kind has a template and an
Emails.<Template> message namespace.
The values an email's copy interpolates, such as the address a change-email approval names.
A rendered email, minus its recipient.
The locale an account email must be written in, read from the link it carries.
Renders an account email in the locale its link carries.
Every account email the app can send, in the order the email gallery shows them.