Bug 34403: Inconsistencies in Currencies and exchange rates page titles, breadcrumbs...

Bug 34403: Inconsistencies in Currencies and exchange rates page titles, breadcrumbs, and header

This patch updates the currencies administration page in order to make
the page title, breadcrumb navigation, and page headings consistent with
each other.

To test, apply the patch and go to Administration -> Currencies and
exchange rates. Test each variation of the page to confirm that the
title, breadcrumbs, and headings are consistent.

- Currencies main page
- New currency
- Edit currency
- Delete currency confirmation

Signed-off-by: David Cook <dcook@prosentient.com.au>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>