s/Connection lost/Not Connected/

IPython/html/static/notebook/js/notificationarea.js

@@ -133,7 +133,7 define([
         });
 
         this.events.on('kernel_connection_dead.Kernel', function (evt, info) {
-            knw.danger("Connection lost", undefined, function () {
+            knw.danger("Not Connected", undefined, function () {
                 // schedule reconnect a short time in the future, don't reconnect immediately
                 setTimeout($.proxy(info.kernel.reconnect, info.kernel), 500);
             }, {title: 'click to reconnect'});