user-sessions: fixed tests and translation mechanism for user sessions.

rhodecode/admin/views/sessions.py

@@ -71,7 +71,7 b' class AdminSessionSettingsView(AdminSett'
     @view_config(
         route_name='admin_settings_sessions_cleanup', request_method='POST')
     def settings_sessions_cleanup(self):
-
+        _ = self.request.translate
         expire_days = safe_int(self.request.params.get('expire_days'))
 
         if expire_days is None:

rhodecode/tests/functional/test_admin_settings.py

@@ -473,7 +473,7 b' class TestUserSessions(object):'
         response = self.app.post(
             self._get_url('admin_settings_sessions_cleanup'), params=post_data,
             status=302)
-        assert_session_flash(response, 'Please execute this command')
+        assert_session_flash(response, 'Cleaned up old sessions')
 
 
 @pytest.mark.usefixtures('app')