You're right. I omit gettext because if I use it in PHP I've to include the gettext package into LAMPP. And the gettext package will size the package up about 3 to 5 megs.
But if there is a need for gettext I will include it in the next LAMPP release. Maybe as extra module if LAMPP gets to big.
If you need gettext right now you have to get the LAMPP development package, download PHP and compile PHP by yourself.