Bug 31858: add TT syntax for ACQORDER notices

Bug 31858: add TT syntax for ACQORDER notices

Test Plan:
    1) Set your ACQORDER notice content to:
        [%- USE Price -%]
        [% bookseller.name %]
        [% FOREACH order IN orders %]
        Ordernumber [% order.ordernumber %] ([% order.biblio.title %] - [% order.biblio.biblioitem.publicationyear %]) (quantity: [% order.quantity %]) ($[% order.listprice | $Price %] each).
        [% END %]
        Thank you,
        [% branch.branchname %]
    2) Set up a vendor with an email, set contact for email so the "E-mail
        order" button shows on a basket for that vendor
    3) E-mail the basket
    4) Check the content is correct

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>