Bug 33808: Add aria-labels in opac-basket.tt

Bug 33808: Add aria-labels in opac-basket.tt

This patch adds an aria-label and an aria-haspopup to Download buttons
identified as non-descriptive in accessibility testing

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit aa0f113f97c1b79b69fc7f3999ced00d3ac2b3c3)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit b1ddaa0b15124afefcfde8ff1e010d79eaa2ead3)
Signed-off-by: Matt Blenkinsop <matt.blenkinsop@ptfs-europe.com>