Content access rules integration - missing function

Hi, testing the content access rules integration I've found a minor bug.

On content_access.rules.inc, function content_access_list_to_checkboxes() calls _content_access_get_operations_lables($operations) which doesn't exists.

A simple fix would be to remove that call:

  $labels = _content_access_get_operations_lables($operations);

and change the line:

    $checkboxes[$op]['#title'] = t($labels[$op]);

to:

    $checkboxes[$op]['#title'] = t($op);

Thanks for the attention.