A recent commit removed the "Thanks for you request!" at the start
of the find accounts email. As Alya Abbott pointed out, this line
actually helps us point out to the user that they are the ones who
requested the email in the first place, lowering the chances that
they'll misinterpret it as spam.
This is a follow-up to issue #19659.
For almost all of these, the verbose support offer clause is almost the same
as the non-verbose version. The distinction carries extra carrying cost when
coming up with new copy, testing new email designs, etc.
Make sure 's, &s, and other characters are not HTML-escaped in subject
lines and plain-text emails.
Hack so that this isn't blocking the release of Zulip 1.6. A more robust way
to do this would be to have two different template Engines, one that renders
HTML, and one that doesn't.
Fixes#5088.