diff --git a/plinth/middleware.py b/plinth/middleware.py
index a44a25072..22c26c132 100644
--- a/plinth/middleware.py
+++ b/plinth/middleware.py
@@ -32,10 +32,10 @@ def _collect_operations_results(request, app):
     operations = operation_module.manager.collect_results(app.app_id)
     for operation in operations:
         if operation.exception:
-            views.messages_error(request, operation.message,
+            views.messages_error(request, operation.translated_message,
                                  operation.exception)
         else:
-            messages.success(request, operation.message)
+            messages.success(request, operation.translated_message)
 
 
 class SetupMiddleware(MiddlewareMixin):
diff --git a/plinth/tests/test_middleware.py b/plinth/tests/test_middleware.py
index a32a6ccff..a967eceef 100644
--- a/plinth/tests/test_middleware.py
+++ b/plinth/tests/test_middleware.py
@@ -150,8 +150,8 @@ class TestSetupMiddleware:
         """Test that module installation result is collected properly."""
         resolve.return_value.namespaces = ['mockapp']
         operation_manager.collect_results.return_value = [
-            Mock(message='message1', exception=None),
-            Mock(message='message2', exception='x-exception')
+            Mock(translated_message='message1', exception=None),
+            Mock(translated_message='message2', exception='x-exception')
         ]
         app.get_setup_state = lambda: app_module.App.SetupState.UP_TO_DATE