Activating translation is not needed

Signed-off-by: Emmy D'Anello <emmy.danello@animath.fr>

participation/tests.py

@@ -9,8 +9,6 @@ from django.core.files.uploadedfile import SimpleUploadedFile
 from django.core.management import call_command
 from django.test import LiveServerTestCase, override_settings, TestCase
 from django.urls import reverse
-from django.utils import translation
-
 from registration.models import CoachRegistration, Payment, StudentRegistration
 
 from .models import Participation, Team, Tournament
@@ -881,7 +879,6 @@ class TestPayment(TestCase):
         """
         Check that the payment reminder command works correctly.
         """
-        translation.activate('fr')
         self.assertEqual(len(mail.outbox), 0)
 
         call_command('remind_payments')