fix an issue with non ascii characters

smash/web/models/mail_template.py

@@ -148,7 +148,7 @@ class MailTemplate(models.Model):
         replacements.update({
             "##DATE_FULL##": current_datetime.strftime(DATE_FORMAT_FULL),
             "##DATE_SHORT##": current_datetime.strftime(DATE_FORMAT_SHORT),
-            "##WORKER##": str(worker)
+            "##WORKER##": unicode(worker)
         })
 
     def _add_appointment_replacements(self, replacements, appointment):
@@ -173,7 +173,7 @@ class MailTemplate(models.Model):
                 "##A_STATUS##": appointment.get_status_display(),
                 "##A_LOCATION##": appointment.location.name,
                 "##A_LOCATION_OR_FLYINGTEAM##": appointment.flying_team or appointment.location.name,
-                "##A_WORKER##": str(appointment.worker_assigned),
+                "##A_WORKER##": unicode(appointment.worker_assigned),
                 '##A_WORKER_PHONE##': worker_phone_number,
                 '##A_WORKER_EMAIL##': worker_email_address,
                 "##A_ROOM##": str(appointment.room),
@@ -197,7 +197,7 @@ class MailTemplate(models.Model):
             else:
                 date_born = None
             replacements.update({
-                "##S_FULL_NAME##": str(subject),
+                "##S_FULL_NAME##": unicode(subject),
                 "##S_FIRST_NAME##": subject.first_name,
                 "##S_LAST_NAME##": subject.last_name,
                 "##S_ADDRESS##": subject.address,