extranet/library/Application/Controller/Plugin/Language.php

<?php
class Application_Controller_Plugin_Language extends Zend_Controller_Plugin_Abstract
{
	public function postDispatch(Zend_Controller_Request_Abstract $request)
	{
		$registry = Zend_Registry::getInstance();
		$translate = $registry->get('Zend_Translate');
		$currLocale = $translate->getLocale();
		$user = new Scores_Utilisateur();
		if ( $user->isLog() ) {
			$langtmp = $request->getParam('langtmp', '');
			if (!$langtmp)
				$langtmp = $user->getLangTmp() ? $user->getLangTmp() : $user->getLang();
			$newLocale = new Zend_Locale();
			$newLocale->setLocale($langtmp);
			$registry->set('Zend_Locale', $newLocale);
			$translate->setLocale($langtmp);
			$user->setLangTmp($langtmp);
			$registry->set('Zend_Translate', $translate);
		} else {
			$langtmp = 'fr';
		}
	}
}