I'm using a modified version of the file: "examples/easy/SetLanguage.php" except that I changed addText to embedHTML as:
// ---------------------------------------
require_once '../../classes/CreateDocx.inc';
$docx=new CreateDocx();
//$docx->setLanguage('es-ES');
$docx->embedHTML('Este documento tiene el español de España como idioma por defecto (The default document language has been set to Spanish-Spain).');
$docx->createDocx('../docx/example_setLanguage');
// ---------------------------------------
And I get this file: http://ge.tt/8cVW1a71/v/0?c
I'm using Ubuntu 12.04 LTS, PHP 5.3.10