Building the language files

I am trying to do a custom build of CKEDITOR using the build.sh in the ckeditor-dev project.

The entire project builds fine, but the individual language files for the plugins aren't building into the outputted file, so I get errors when I try to run the editor on the client-side complaining about things such as "Uncaught TypeError: Cannot read property 'label' of undefined."

Is there a way to ensure that all of the lang files get built with the project? For reference, this is my build-config.js file:

/**
 * @license Copyright (c) 2003-2013, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.html or http://ckeditor.com/license
 */

var CKBUILDER_CONFIG = {
	skin: 'moono',
	ignore: [
		'dev',
		'README.md',
		'.gitignore',
		'.gitattributes',
		'.idea',
		'.mailmap',
		'.DS_Store'
	],
	languages: {
		'en': 1
	},
	plugins: {
		basicstyles: 1,
		button: 1,
		clipboard: 1,
		dialog: 1,
		dialogui: 1,
		fakeobjects: 1,
		floatingspace: 1,
		floatpanel: 1,
		format: 1,
		indent: 1,
		justify: 1,
		link: 1,
		list: 1,
		listblock: 1,
		panel: 1,
		pastefromword: 1,
		pastetext: 1,
		removeformat: 1,
		richcombo: 1,
		stylescombo: 1,
		toolbar: 1,
		undo: 1,
		font: 1,
		datafield: 1,
		emailChanel: 1,
		pagination: 1
	}
};