How to change the input language of CKEDITOR

I need to set the input language of HTM Editor as Farsi. Can i done this with
CKEditor ? ?.
I already done this with some textboxes and textareas with a .js file named
"FarsiType.js".

FarsiType.js is here : http://www.farsitype.ir/FarsiType.js

When we add an attribute lang="fa" with textbox control its input will be
change to Farsi language.

like this :
<asp:TextBox runat="server" ID="tr" lang="fa" dir="rtl"/>