* @todo Locale message dirs should be named LOCALE.CHARSET and not LOCALE_CHARSET, e.g. "zh_CN.utf8" instead of "zh_CN_utf-8" (according to gettext)
*/

But I see

	'zh-CN-utf-8' => array( 'name' => NT_('Chinese(S) utf-8 (CN)'),
										'charset' => 'utf-8',
										'datefmt' => 'y-m-d',
										'timefmt' => 'H:i:s',
										'startofweek' => 1,
										'messages' => 'zh_CN_utf-8',
										'enabled' => 0,
									),
....

It must be

'messages' => 'zh_CN.utf-8',

and I think it should be

'zh-CN.utf-8' => array