pfSense

This is also mentioned on #13240 but in the interest of only having one problem per issue we can keep this one and change the other to only mention its second point.

It's worth noting that the same style code is in source:src/usr/local/www/services_dhcpv6.php#L614 but the string is initialized first to say Prefix Delegation which is helpful since it indicates to the user that it's a dynamic entry. I think that was the intent here but that line didn't make it into this new code.

Applied in changeset 2a9f6b409bdde67c065a0fa6b13296bbad6c6794.

This is working perfectly on snapshots.