diff --git a/src/backend/core/api/serializers.py b/src/backend/core/api/serializers.py
index a90990c2..4365884a 100644
--- a/src/backend/core/api/serializers.py
+++ b/src/backend/core/api/serializers.py
@@ -23,7 +23,7 @@ class UserSerializer(serializers.ModelSerializer):
 
     class Meta:
         model = models.User
-        fields = ["id", "email", "full_name", "short_name"]
+        fields = ["id", "email", "full_name", "short_name", "language"]
         read_only_fields = ["id", "email", "full_name", "short_name"]
 
 
diff --git a/src/backend/core/tests/test_api_users.py b/src/backend/core/tests/test_api_users.py
index cb3022d3..d99e0406 100644
--- a/src/backend/core/tests/test_api_users.py
+++ b/src/backend/core/tests/test_api_users.py
@@ -158,6 +158,7 @@ def test_api_users_retrieve_me_authenticated():
         "id": str(user.id),
         "email": user.email,
         "full_name": user.full_name,
+        "language": user.language,
         "short_name": user.short_name,
     }
 
diff --git a/src/backend/demo/defaults.py b/src/backend/demo/defaults.py
index 4f6fb5a2..4b082e39 100644
--- a/src/backend/demo/defaults.py
+++ b/src/backend/demo/defaults.py
@@ -7,17 +7,12 @@ NB_OBJECTS = {
 }
 
 DEV_USERS = [
+    {"username": "impress", "email": "impress@impress.world", "language": "en-us"},
+    {"username": "user-e2e-webkit", "email": "user@webkit.e2e", "language": "en-us"},
+    {"username": "user-e2e-firefox", "email": "user@firefox.e2e", "language": "en-us"},
     {
-        "username": "impress",
-        "email": "impress@impress.world",
+        "username": "user-e2e-chromium",
+        "email": "user@chromium.e2e",
+        "language": "en-us",
     },
-    {
-        "username": "user-e2e-webkit",
-        "email": "user@webkit.e2e",
-    },
-    {
-        "username": "user-e2e-firefox",
-        "email": "user@firefox.e2e",
-    },
-    {"username": "user-e2e-chromium", "email": "user@chromium.e2e"},
 ]
diff --git a/src/backend/demo/management/commands/create_demo.py b/src/backend/demo/management/commands/create_demo.py
index d07df613..74c02709 100644
--- a/src/backend/demo/management/commands/create_demo.py
+++ b/src/backend/demo/management/commands/create_demo.py
@@ -179,7 +179,8 @@ def create_demo(stdout):
                     is_superuser=False,
                     is_active=True,
                     is_staff=False,
-                    language=random.choice(settings.LANGUAGES)[0],
+                    language=dev_user["language"]
+                    or random.choice(settings.LANGUAGES)[0],
                 )
             )