Several major improvements: Memberlist page added (planned since about beta 2), page group support added for non-JS ACL editor (oops!), and attempting to view a page for which you lack read permissions will get you logged.

// UK lang variables

tinyMCE.addToLang('',{
directionality_ltr_desc : 'Direction left to right',
directionality_rtl_desc : 'Direction right to left'
});