Bug 16474: Standardize spelling of EDIFACT

Bug 16474: Standardize spelling of EDIFACT

Some templates use Edifact and edifact. As EDIFACT
is an abbreviation, we should spell it like one.

To test:
- Check templates for occurrences of EDIFACT
  - acquisitions navigation menu
  - basket page
  - basketgroup page
  - EDIFACT messages page
- Verify changes are correct

Signed-off-by: Hector Castro <hector.hecaxmmx@gmail.com>
Changes are correct

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Jesse Weaver <jweaver@bywatersolutions.com>