* integrate Marko Samastur's translate.js with gettext and php
* translate the first JavaScript strings
* add scripts/i18n.php to generate the list of i18n dictionary
* Makefile creates/updates po/davadmin.pot, .po, and .mo files
* admin/i18n.inc.php sets the locale and puts it in the session
* admin/common.inc.php and admin/getgroups.php use admin/i18n.inc.php
* po/pot.sed replaces generated header of po/davadmin.pot
