Bug 10100: adds a class to OPAC news dates

Bug 10100: adds a class to OPAC news dates

Adds a "newsfooter" class to allow CSS modification
of the date appearing as a footer on each news.

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Adds a class, checked po files to make sure change is string safe.
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>
(cherry picked from commit 8901374b934c087b458195d9d1e7828f35aa74e0)

Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>