Initial cosmetic changes to the process of verifying a changed email

api/templates/email_change_subject.html

@@ -1 +1 @@
-{{define "email_change_subject"}}You updated your email for {{.Props.TeamDisplayName}} on {{ .Props.Domain }}{{end}}
+{{define "email_change_subject"}}[{{.ClientProps.SiteName}}] Your email address has changed for {{.Props.TeamDisplayName}}{{end}}