$translate->getMessages( new Zend_Locale('de') );
// -> Warning: Illegal offset type in /xxx/framework.zend.com/Zend/Translate/Adapter.php on line 333

    /**
     * Returns all available translations from this adapter
     * If no locale is given, the actual language will be used
     * If 'all' is given the complete translation dictionary will be returned
     *
     * @param  string|Zend_Locale $locale (optional) Language to return the messages from
     * @return array
     */
    public function getMessages($locale = null)
    {
        if ($locale == 'all') {
            return $this->_translate;
        }
        if (empty($locale) or !$this->isAvailable($locale)) {
            $locale = $this->_options['locale'];
        }
        return $this->_translate[$locale];
    }