Write cookies before page generation, so changes take effect immediately.

pages/settings.mako

@@ -1,7 +1,7 @@
-<%include file="/support/header.mako" args="environ=environ, cookies=cookies, title='Settings - Earwig\'s Copyvio Detector'"/>\
 <%namespace module="copyvios.settings" import="main"/>\
-<%! from json import dumps, loads %>\
 <% bot, status, langs, projects = main(environ, headers, cookies) %>\
+<%include file="/support/header.mako" args="environ=environ, cookies=cookies, title='Settings - Earwig\'s Copyvio Detector'"/>\
+<%! from json import dumps, loads %>\
             % if status:
                 <div class="green-box">
                     <p>${status}</p>