Improve automatic emails with temporary urls

This MR targets the improvement for automatic emails concerning validation of new users by supervisors/re-validation of users.

Fixes #542 (closed)

Fixes #550 (closed)

beat/web/accounts/management/commands/year_revalidation_users.py

@@ -40,6 +40,7 @@ from django.template import loader
 
 from ...models import SupervisionTrack
 from ...models import Profile
+from ...models import TemporaryUrl
 from ....ui.registration.models import RegistrationProfile
 from ....utils import mail
 
@@ -210,9 +211,13 @@ class Command(BaseCommand):
                                     if supervisiontrack.expiration_date.date() - now.date() == datetime.timedelta(days=expiration_reminder):
                                         warned_count += 1
 
+                                        temp_url = TemporaryUrl.objects.create_temporary_url(TemporaryUrl.YEARREVALIDATION, supervisiontrack)
+
                                         context = {
                                             'user': user,
                                             'expiration_date': supervisiontrack.expiration_date.date(),
+                                            "prefix": server_address,
+                                            "temp_url": temp_url.url_hash,
                                         }
 
                                         mail.send_email('registration/mail.account_revalidation.subject.txt',