trivial: fix comment about agent portal cookie duration

data/themes/gadjo/static/js/publik.js

@@ -158,7 +158,7 @@ $(function() {
    * name. Live with it. */
   var cookie_domain = window.location.hostname.split('.').slice(1).join('.');
   var date = new Date();
-  date.setTime(date.getTime() + (10 * 86400 * 1000)); /* a week */
+  date.setTime(date.getTime() + (10 * 86400 * 1000)); /* a long week */
   document.cookie = 'publik_portal_agent_url=' +
           encodeURIComponent(PUBLIK_PORTAL_AGENT_URL) +
           '; expires=' + date.toGMTString() +