So, I’m going to do this for my sites:
js.user.email_messages_level, which defaults to “Send me an email when someone messages me”, becomes:
Send me an email when I receive a personal message
This matches the term “personal message” used in the preference to enable / disable personal messages from other members.
js.user.email_level.title, which defaults to “Send me an email when someone quotes me, replies to my post, mentions my @username, or invites me to a topic”, becomes:
Send me an email for all notifications. This includes posts in watched topics, categories, and tags; and when someone quotes me, replies to my post, or mentions my @username
(We don’t have invites enabled, so I left that out.)