Bug 21130: (Follow up OPAC Results) Prevent HTML class from being translated

This fixes the same issue where "title" is being translated (in fr-CA at least) and thus
break the javascript impacting the result display in the OPAC

Signed-off-by: Hayley Mapley <hayleymapley@catalyst.net.nz>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>