Bug 12465: Improve display of MARC21 710 in intranet and OPAC

Bug 12465: Improve display of MARC21 710 in intranet and OPAC

Currently, 710$a and $b and $b will not display correctly.
This patch tries to improve the display adding the missing
space between both subfields.

Please test.

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Tested, work as described on staff & opac for 710 detailed view.
Add space and punctuation.
No errors.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>