fix: Rendering of email templates needs access to settings (#4163)

Since #4104.

ietf/utils/mail.py

@@ -183,6 +183,7 @@ def send_mail(request, to, frm, subject, template, context, *args, **kwargs):
     The body is a text/plain rendering of the template with the context.
     extra is a dict of extra headers to add.
     '''
+    context["settings"] = settings
     txt = render_to_string(template, context, request=request)
     return send_mail_text(request, to, frm, subject, txt, *args, **kwargs)
 
@@ -628,4 +629,4 @@ def get_payload_text(msg, decode=True, default_charset="utf-8"):
     payload = msg.get_payload(decode=decode)
     payload = payload.decode(str(charset))
     return payload
-
+