Bug 11122: Address MARC21 vs. UNIMARC issue

Bug 11122: Address MARC21 vs. UNIMARC issue

In comment #6 and comment #17, Katrin pointed out the discrepancy
between UNIMARC (using publisheryear) vs. Other MARC installations
(using copyrightdate). This was dealt with in invoice.tt already.
This patch does similar logic for the other 3 template files.

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Mason James <mtj@kohaaloha.com>