use "correct" URL on logo in admin header
Beacuse mySoc-hosted admin sites are proxied via our secure server and hence are
on a different domain, the logo link in the header is usually wrong.
Actually this was for the myanmar cobrand work.
hide the public-user menu in admin site
and replace it with a link to the live site
(actually using the URL as the link text because it's convenient in mySoc-hosted
admins *and* dev sites ;-) ...it's also language-independent for the administrator)