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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
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