multiple-woo-string-translation.php

<?php

add_filter('gettext', 'translate_reply');
add_filter('ngettext', 'translate_reply');
    function translate_reply($translated) {
        $translated = str_ireplace('Be the first to review', 'Sé el primero en comentar', $translated);
        $translated = str_ireplace('There are no reviews yet', 'No hay comentarios aún', $translated);

        // For More WooCommerce String Translation
        //$translated = str_ireplace('english string', 'spanish string', $translated);
        return $translated;
    }