Bug 28280: itemtype page, add price formatting

Bug 28280: itemtype page, add price formatting

To Test:
1- create an item type with a 'Default replacement cost' and a
'Processing fee (when lost)'
2- numbers are displayed with 6 decimals.
4- apply patch
5- numbers are displayed with 2 decimals.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>