Making csv download links more accessible (Bug #1266913)

Sorted on:
--  Administration -> Users -> User search -> Get reports
--  Administration -> Institutions -> Statistics

Change-Id: I81e7def9a003e95c2a40651c08d7cdfede0eda89
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>
Merge "Making csv download links more accessible (Bug #1266913)"