lang: translation of django's response

frontend/static/js/api/client.js

@@ -114,6 +114,7 @@ class Client
 			headers: {
 				"Content-Type": "application/json",
 				"X-CSRFToken": getCookie("csrftoken"),
+				'Accept-Language': this.lang.currentLang,
 			},
 			body: JSON.stringify(data),
 		});

transcendence/settings.py

@@ -13,6 +13,7 @@ https://docs.djangoproject.com/en/4.2/ref/settings/
 import os
 
 from pathlib import Path
+from django.utils.translation import gettext_lazy as _
 
 # Build paths inside the project like this: BASE_DIR / 'subdir'.
 BASE_DIR = Path(__file__).resolve().parent.parent
@@ -79,6 +80,7 @@ MIDDLEWARE = [
     'django.contrib.auth.middleware.AuthenticationMiddleware',
     'django.contrib.messages.middleware.MessageMiddleware',
     'django.middleware.clickjacking.XFrameOptionsMiddleware',
+    'django.middleware.locale.LocaleMiddleware',
 ]
 
 ROOT_URLCONF = 'transcendence.urls'
@@ -137,6 +139,11 @@ AUTH_PASSWORD_VALIDATORS = [
 
 LANGUAGE_CODE = 'en-us'
 
+LANGUAGES = [
+    ('en', _('English')),
+    ('fr', _('French')),
+]
+
 TIME_ZONE = 'UTC'
 
 USE_I18N = True