problem change language in ckeditor

hi there
i downloaded ckeditor from https://www.ads-software.com/plugins/ckeditor-for-wordpress/ and change the ckeditor-for-wordpress\ckeditor\config.js like this:

CKEDITOR.editorConfig = function( config ) {
	// Define changes to default configuration here. For example:
	config.language = 'fa';
	// config.uiColor = '#AADC6E';
};

but nothing changes, i want to change the language

thanks in advanced.