def METHOD_NAME(self):
    """ Get the preferences with parameter `lang`.
    """
    headers = self.add_authorization_header(username='contributor')
    response = self.app.get(
        self._prefix + '?pl=de', status=200, headers=headers)
    body = response.json
    areas = body['areas']
    locale = areas[0]['locales'][0]
    self.assertEqual('de', locale['lang'])