[xwiki-users] unrendered checkboxes in Administration - Rights

Hi, I have switched the default language to 'de' and then tried to administer "Rights". There are 2 checkboxes ("Prevent unregistered users from ...", in german "Verhindern, dass nicht registrierte Benutzer ..." ) that can not be rendered. Instead I get the labels "$view_alt" and "$edit_alt". Jens