Bug 33808: Add aria-labels in basket.tt

Bug 33808: Add aria-labels in 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 e0813a3b3dc68f8498ec83cd7df2b0ebad099378)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit 12ee1fde0de083d3519cee46259a3f2c8848c64b)
Signed-off-by: Matt Blenkinsop <matt.blenkinsop@ptfs-europe.com>