Bug 15049: (Signed off) Hide currency but preserv alert

 Bug 15049: (Signed off) Hide currency but preserv alert

This follow up hides currency, but the alert pops
if no currency is active.

To test:
1) Apply the patch
2) Unset any active currency
3) Alert must show on Acquisitons home
4) Set a currency active, no currency display on Acqui home
5) Check that currency IS displayed on /cgi-bin/koha/admin/aqbudgets.pl
or /cgi-bin/koha/admin/aqbudgetperiods.pl

Amended for better translation

Currency does / does not display as described in test plan.
Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: JM Broust <jean-manuel.broust@univ-lyon2.fr>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>