Fix translation usage

aleksis/apps/paweljong/schema/event_registration.py

@@ -103,7 +103,7 @@ class SendEventRegistrationMutation(graphene.Mutation):
                 },
             )
         except IntegrityError:
-            raise ValidationError(_("A person using the e-mail address %s already exists." % email))
+            raise ValidationError(_("A person using the e-mail address %s already exists.") % email)
 
         # Store contact information in database
         for field_name in ["date_of_birth", "sex", "address", "mobile_number"]:
@@ -136,7 +136,7 @@ class SendEventRegistrationMutation(graphene.Mutation):
                             email=guardian_data["email"],
                         )
                     except IntegrityError:
-                        raise ValidationError(_("A person using the e-mail address %s already exists." % guardian_data["email"]))
+                        raise ValidationError(_("A person using the e-mail address %s already exists.") % guardian_data["email"])
 
                     person.guardians.add(guardian)
             person.save()