LP1818086 Accessible text for grid flair icons (Angular)

LP1818086 Accessible text for grid flair icons (Angular)

Adds visually-hidden text alongside grid flair icons so that the title,
if given, will be announced in place of the icon keyword. Keywords are
hidden in ARIA regardless of whether the title was specified.

For the flair column, the ngbTooltip has been replaced with a standard
title attribute, for consistency with other icons throughout the
interface.

Signed-off-by: Stephanie Leary <stephanie.leary@equinoxoli.org>
Signed-off-by: Jane Sandberg <js7389@princeton.edu>