LP1888723 Volcopy strings should be global

LP1888723 Volcopy strings should be global

Moving the <eg-string /> entries to the root of the tepmlate ensures all
references to those strings are defined / non-null.  Otherwise, if the
user opts to hide a field which contained its own strings (e.g. loan
duration), the code would fail on null references, e.g.:

ERROR TypeError: Cannot read property 'text' of undefined

Signed-off-by: Bill Erickson <berickxx@gmail.com>
Signed-off-by: Ruth Frasur <rfrasur@library.in.gov>
Signed-off-by: Galen Charlton <gmc@equinoxOLI.org>