tidy bidi support

remove unused variable, redundant comment, don't need jquery

notebook/static/bidi/bidi.js

@@ -5,15 +5,14 @@ define(['bidi/numericshaping'], function(numericshaping) {
   'use strict';
 
   var shaperType = '';
-  var textDir = '';
 
   var _uiLang = function() {
     return navigator.language.toLowerCase();
   };
 
   var _loadLocale = function() {
     if (_isMirroringEnabled()) {
-      $('body').attr('dir', 'rtl');
+      document.body.dir = 'rtl';
     }
 
     require(['moment'], function (moment) {
@@ -27,11 +26,6 @@ define(['bidi/numericshaping'], function(numericshaping) {
     return new RegExp('^(ar|he)').test(_uiLang());
   };
 
-  /**
-     * NS :  for digit Shaping.
-     * BTD : for future work in case of Base Text Direction Addition.
-     */
-
   /**
      * @param value : the string to apply the bidi-support on it.
      * @param flag :indicates the type of bidi-support (Numeric-shaping ,Base-text-dir ).