Bug 10971: Hide EAN search for MARC21 / template corrections

Bug 10971: Hide EAN search for MARC21 / template corrections

This patch hides the EAN filter on the page for ordering from
a subscription when the marcflavour is not UNIMARC as it will
only work for this flavour currently.

It also corrects
- branch to library
- supplier to vendor
- the library code in the result list to the branch name

To test:
- Make sure you have a subscription, not the vendor
- Create a new basket for the subscription vendor
- Choose 'from a subscription' to create your order line
- Look at the filters on the left side, switch
  the marcflavour system preference to see change for
  the EAN filter
- Verify changes

Signed-off-by: Brendan Gallagher <brendan@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>