i18n support for a few OPAC strings

i18n support for a few OPAC strings

Enable translation of the "More copies listed in full record details"
message for the search results library / call number / item /status
lines

Also provide translation support for the hold queue status message,
including singular / plural variants (most languages do not provide
the equivalent of the "item(s)" idiom in English).

Instead of burying the display of hold queue status with a hard
coded "if (false)" test, turn it into a top-level variable for
a bit more exposure.

git-svn-id: svn://svn.open-ils.org/ILS/trunk@19262 dcc99617-32d9-48b4-a31d-7c20da2025e4