Bug 28047: Standardize: Call number, callnumber, Call no. etc.

Bug 28047: Standardize: Call number, callnumber, Call no. etc.

This patch modifies instances in the template where variations of "Call
number" are used. Instead of "Call no." "Call no" or "callnumber," "Call
number" is used instead.

To test, apply the patch and test the following pages to confirm that
the label has been correctly updated. In the staff interface:

- Circulation -> Check out to a patron with checkouts -> View the table
  of checked-out items.
  - Check out to a patron who is guarantor to a patron with checkouts ->
    View the table of the relative's checked-out items.
- Catalog -> Bibliographic detail page
  -> Holdings table
  -> Place hold -> Check "specific items" table
  -> Rota (Stock rotation)
- Pending on-site checkouts
- Circulation -> Transfers to receive
- Circulation -> Transfers to send
- Patron -> Patron details
  -> Print -> Print summary
  -> Circulation history

In the OPAC:

- Log in as a user with checkouts
  -> View the checkout tab on the "Your summary" page
  -> Your checkout history

In self checkout:

- Log in as a user with checkouts -> View the checkouts table.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>