CMS category description - add TinyMce

[IgorSB]

I can't find solutions for add TinyMce editor for CMS category description for 1.7.6.5. I have made changes by following this article:

 

classes/CMSCategory.php
'description' => array('type' => self::TYPE_HTML, 'lang' => true, 'validate' => 'isCleanHtml'),

controllers/admin/AdminCmsCategoriesController.php

array(
'type' => 'textarea',
'label' => $this->trans('Description', array(), 'Admin.Global'),
'name' => 'description',
'autoload_rte' => true,
..............

And there is no changes in admin, even if try change 'label' => $this->trans('Description... to 'label' => $this->trans('DescriptionTestChange ...

Cached cleared in var/

Also with override no luck.

Please, does someone have solution?