[ui][templates][registration] add temporary link message to yearly revalidated profiles

beat/web/ui/registration/templates/registration/mail.account_revalidation.message.txt

@@ -10,4 +10,6 @@ If you haven't done this by this expiration date: {{ expiration_date }}, your ac
 will be blocked and you will then need to go trough an account revalidation
 procedure to re-activate it.
 
+You can also click on the following direct link to accomplish this action and re-validate your account at {{ prefix }}/accounts/temp/{{ temp_url }}
+
 BEAT Administrators at the Idiap Research Institute