Initials when searching for users should have descriptive hidden text

[Jono M]

When searching for users in Administration -> User search there is an option to filter by first or last initial. However, the links for both contain only the letter and no other description, so for screen reader users it can be hard to tell whether (for example) an "F" link will filter by first name or last name.
Either descriptive hidden text should be added to each initial, or the links should use aria-labelledby to link to the label at the start of the row.

Affects latest master (using Orca 3.10.1)

(WCAG Level AAA)

[Mahara Bot (dev-mahara)]

Patch for "master" branch: https://reviews.mahara.org/3387

[Mahara Bot (dev-mahara)]

Reviewed: https://reviews.mahara.org/3387
Committed: http://gitorious.org/mahara/mahara/commit/0235284d6c11d9160b5d7240688581447bbde65f
Submitter: Son Nguyen (<email address hidden>)
Branch: master

commit 0235284d6c11d9160b5d7240688581447bbde65f
Author: Robert Lyon <email address hidden>
Date: Wed May 28 09:06:52 2014 +1200

Better accessibility for User search filter by initials (Bug #1266920)

- Added the aria-labelledby attribute (read by orca)
- Added the aria-label attribute (not read by orca but seeing if it
will be read by Jaws)
- Added an accessible hidden span to alert screenreader what is to
follow

Change-Id: I21e48b9cce3998e3435b157e144a6ece9c47974b
Signed-off-by: Robert Lyon <email address hidden>