Bug 19833: Kill the "biblios"

Bug 19833: Kill the "biblios"

1) Check files modules/about.tt, modules/acqui/booksellers.tt and
modules/acqui/invoices.tt for typos nad check that there are no "biblio"
and only "biblographic record".

Fixed one capitalization error during signoff.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>