How to implement the plugin of Table of Contents

Hi,

I am new to CK Editor.
My requirement is I require Table of Contents for CK Editor.

After searching quite a lot, I got the plugin from the following location :
viewtopic.php?f=6&t=13897

Now, as mentioned in toc.patch I implemented the changes in the following files:
_source/core/config.js
_source/lang/en.js
_source/plugins/toc/plugin.js
_source/plugins/toolbar/plugin.js
_source/skins/v2/skin.js
_source/skins/v2/toc.css

But the problem is, I do not see the changes implemented.
I think, the changes I have made inside the _source directory needs to be reflected outside the source directory ...
that is, say I have made changes in the file "ckeditor/_source/lang/en.js" needs to reflect to the file "ckeditor/lang/en.js".

Can someone please provide the steps I need to follow so that the changes are reflected and I am able to use Table of Contents.