gistfile1.php

<?php

$po = new Po4a(array(
    'masterTranslationFile' => "{$this->translationsDir}/%master.pot",
    'translationFile'       => "{$this->translationsDir}/%master-%lang.po",
    'sourceLanguage'        => 'pt',
    'targetLanguages'       => array('en', 'es', 'de'),
    'force'                 => true,
    'files'                 => array(
        array(
            'fileType'   => 'xhtml',
            'masterFile' => 'page1.html',
            'targetFile' => 'page1-%lang.html'
        ),
        array(
            'fileType'   => 'xhtml',
            'masterFile' => 'page2.html',
            'targetFile' => 'page2-%lang.html' 
        )
    ),
    'buildOptions' => array(
        'masterCharset'    => 'UTF-8',
        'localizedCharset' => 'UTF-8',
        'keep'             => '0'
    )
));

$po->build();

?>