pfSense

Make sure to include a form (POST to "") with a submit button (name="accept") and a hidden field with name="redirurl" and value=""

and below there's a code example with:

<form method="post" action="$PORTAL_ACTION$">
   ...
   <input name="redirurl" type="hidden" value="$PORTAL_REDIRURL$">
   ...
</form>

Note the actions and value certainly are not empty as suggested above. All those %#$s in gettext clearly don't work as expected.