Bug 10807: (follow-up) wording tweak; take OpacAuthorities into account

Bug 10807: (follow-up) wording tweak; take OpacAuthorities into account

This follow-up makes two changes:

1) Change "biblio" to "catalog" when referring to non-authority
   searches.
2) Make display of the authority search tab dependent on the
OpacAuthorities system preference. If OPAC authority searches are
disabled we shouldn't show a tab which will always be empty.

To test, view the OPAC search history page with the OpacAuthorities
preference both on and off.

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>