Added function "is_superadmin" in auth library and improved other functions.

Till Brehm

2014-08-13 19b5e01da02aa2115ee802cf2e43a7f3e58f4eac

 interface/web/mail/lib/lang/ja_mail_user_list.lng

@@ -4,4 +4,5 @@
$wb['autoresponder_txt'] = 'Autoresponder';
$wb['add_new_record_txt'] = 'Add new Mailbox';
$wb['name_txt'] = 'Realname';
$wb['login_txt'] = 'Login';
?>