Bug 5616: UTF-8 problem in Card View / Follow up

Bug 5616: UTF-8 problem in Card View / Follow up

Decode data only if needed.
Add instruction to use UTF8 in html header.
Force utf8 on output handle.

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Umlauts and other diacritics in card view of z39.50 search are now
correctly displayed.

Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>
  removed 2 commented lines

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
(cherry picked from commit 980d8fbed45b3d43341347e612b777b54fd12d10)

Signed-off-by: Chris Nighswonger <chris.nighswonger@gmail.com>