Bug 16037: Renaming 'Print basket group' as 'Export as PDF'

 Bug 16037: Renaming 'Print basket group' as 'Export as PDF'

To test:
1) Go to Acquisitions
2) Go to the basket groups for a vendor
3) Confirm that an open basket group has the option to 'Close and export as PDF'
4) Confirm that a closed basket group has the option to 'Export as PDF'
5) Confirm these buttons still work as expected

Sponsored-by: Catalyst IT
Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>