Bug 27405: Update koha-tmpl/intranet-tmpl/prog/en/modules/pos/register.tt for ACC2

Bug 27405: Update koha-tmpl/intranet-tmpl/prog/en/modules/pos/register.tt for ACC2

This replaces the number type input in
intranet-tmpl/prog/en/modules/pos/register.tt so that it is
consistent with ACC2 guidelines.

Test plan:
1. Enable the EnablePointOfSale (set to Enable) and UseCashRegisters
   (set to Use) system preferences.
2. Add a new cash register for a library (Home > Point of sale > Create
   a new cash register)
3. Add some sample items for sale (Home > Point of sale > Configure
   items for purchase)
4. Add some sales (Home > Point of sale > Add some items, enter a
   payment and sleect Confirm)
5. Issue a refund (Home > Point of sale > Register details > select
   Issue refund for an item)
6. Try to enter text, numbers with several decimal places, and , or
   multiple .
7. Apply the patch.
8. Repeat steps 4-6 - should continue to function as expected, with
   appropriate warning messages for invalid entries.
9. Search koha-tmpl/intranet-tmpl/prog/en/modules/pos/register.tt for
   input type="number" - there should be no occurences.
10. Sign off!

Sponsored by Catalyst IT

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>