Bug 28838: add unique IDs to sco-main.tt impossible errors

Bug 28838: add unique IDs to sco-main.tt impossible errors

To test:
1. Apply patch
2. Go SCO and try to checkout some items that will generate some of the
   following errors:

The system does not recognize this barcode.
You have checked out too many items and can't check out any more.
This item is checked out to someone else.
You cannot renew this item again.
This item is not for loan.
You owe the library [% DEBT | $Price %] and cannot check out.
This item has been withdrawn from the collection.
This item is restricted.
This item is on hold for another patron.
This item belongs to another branch.
Your account has expired.
Your account has been suspended.
This card has been declared lost.
Your contact information seems to be incomplete.
Due date is not valid.
Item must be checked out at a circulation desk.

3. The display should be exactly as it was without the patch but if you
   use the browsers dev tools you should be able to inscept each error
   message and see that it is now wrapped in a <span> with an ID.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>