Bug 19188: Self checkout missing currency symbol

Bug 19188: Self checkout missing currency symbol

Test plan:
1. Under administration and system preferences, enable WebBasedSelfCheck
2. In OPAC give user fine by going to 'my account' at top right
3. Then under fines tab 'create manual invoice'
4. Make sure this amount is more than noissuescharge which can be
   changed under system preferences
5. Go to the web based self check from the OPAC URL
6. Log in as your user
7. Try to check out an item
7. Error 'Item cannot be checked out' should occur
8. With the patch, the currency symbol should show for the amount.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>