module.config.php

'service_manager' => array(
    'factories' => array(
        'translator' => 'Zend\I18n\Translator\TranslatorServiceFactory',
    ),
),
'translator' => array(
    'locale' => 'pt_BR',
    'translation_file_patterns' => array(
        array(
            'type'     => 'phparray',
            'base_dir' => __DIR__ . '/../language',
            'pattern'  => '%s.php',
        ),
    ),
),