Excessive announcements in screen readers

[jonnystening]

Is your feature request related to a problem? Please describe. The date picker dialog announces the month and year frequently in screen readers.

• On opening of the dialog, because div.duet-date__dialog is aria-labelledby the aria-live H2
• On change of either the month or date using the select inputs or previous/next buttons
• On entering the table, because table.duet-date__table is aria-labelledby the aria-live H2

Describe the solution you'd like

• replace aria-labelledby on div.duet-date__dialog with aria-label="Date picker" to provide context for the feature.
• leave the aria-live H2 as is, since it provides useful updates
• remove the aria-labelledby from table.duet-date__table