Bug 11514: Untranslatable "Uncertain" text in acq

Bug 11514: Untranslatable "Uncertain" text in acq

This patch modifies two pages so that the "Uncertain price" information
is shown by the template rather than the Perl script, making the text
translatable.

To test, apply the patch and go to Acquisitions.

 - Locate or create an order in a basket which has an uncertain price.
 - When viewing the contents of that basket the order which was marked
   as having an uncertain price should be labeled "Uncertain."
 - The same should be true for the invoice page. If you don't have an
   existing invoice with an "uncertain" order,
   - Go to "Receive shipments" for the vendor your "uncertain" order is
     with.
   - Create a new invoice.
   - Receive one or more orders which has an uncertain price.
   - Press the "finish receiving" button.
   - In the "Invoice details" section of the invoice page you should
     see the "Uncertain" label on the correct order.

Signed-off-by: Christophe Croullebois <christophe.croullebois@biblibre.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
For the invoice view: close, receive, reopen, mark prices uncertain, go
to the invoice page (not sure it's expected however)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>