message: add aria-labels to dialog actions
diff: @@ -37,6 +37,7 @@ const ModalDialog = ({
  <Button
  color="primary"
  onClick={onDismiss}
  + aria-label={cancelLabel}
  >
  { cancelLabel }
  </Button>
  @@ -44,6 +45,7 @@ const ModalDialog = ({
  <Button
  color="primary"
  onClick={onAccept}
  + aria-label={okLabel}
  >
  { okLabel }
  </Button>
  