remove unused dependecy and css class

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

@@ -2140,8 +2140,7 define([
     Notebook.prototype.rename_error = function (xhr, status, error) {
         var that = this;
         var dialog_body = $('<div/>').append(
-            $("<p/>").addClass("rename-message")
-            .text('This notebook name already exists.')
+            $("<p/>").text('This notebook name already exists.')
         );
         this.events.trigger('notebook_rename_failed.Notebook', [xhr, status, error]);
         dialog.modal({

IPython/html/static/notebook/js/savewidget.js

@@ -7,12 +7,11 define([
     'base/js/utils',
     'base/js/dialog',
     'base/js/keyboard',
-    'dateformat',
 ], function(IPython, $, utils, dialog, keyboard) {
     "use strict";
 
     var SaveWidget = function (selector, options) {
-        // TODO: Remove circulat ref.
+        // TODO: Remove circular ref.
         this.notebook = undefined;
         this.selector = selector;
         this.events = options.events;