hmm, that seems like the right change to make but it scares me. tower's [activate()](https://github.com/clouserw/tower/blob/master/tower/__init__.py#L92) seems like it might be out of sync with Django's [activate()](https://github.com/django/django/blob/master/django/utils/translation/__init__.py#L129). However, ``activate_lang`` is only used in one place (purchase receipt!) so I think your fix is fine. Good catch.