Pascal Engélibert authored Oct 02, 2021 and Mike Fleetwood committed Oct 09, 2021

Accessibility relations are essential for usage with screen readers.  It
enables the screen reader to read the corresponding label along with the
value of a widget when it gains focus, rather than just the value of the
widget itself.

Test by running Orca screen reader and tab around the elements of the UI
and listen to what is read out.  For example before it would be
"500 GiB", where as after it would be "Unused 500 GiB".

Closes !92 - Add accessibility relations