Translate or replace any string in WordPress or woocommerce using gettext

Translate or replace any string in WordPress or woocommerce using gettext

add_filter('gettext', 'translate_reply');
add_filter('ngettext', 'translate_reply');

function translate_reply($translated) {
$translated = str_ireplace('Leave a Reply', 'Dejar un Comentario', $translated);
return $translated;
}

http://speakinginbytes.com/2013/10/gettext-filter-wordpress/