It's the little things that bite us.

A minor change to note that weewx.conf takes priority over any skin.conf entries, and add weewx.conf placeholders for Units : Group entries as examples.
If you have an installation that is already displaying the labels as you want them, then this update is not required. The changes can be viewed as here

This change is required for the label logic when manually changing units to something other than what is in the weewx database.

See How options work in the Customizing Guide for the full details.