Allow use of an initial color selection. [1765]
Some accessibility improvements. [1765]

Just trying to bring things up to par with the official JDK behavior.
So far it’s mostly just setting properties that screen readers can use
(and using locale-specific labels).

I still need to get tooltips and keyboard navigation of both the “main”
and “recent” swatch panels working before this could be considered
functionally equivalent to the official swatch stuff.