Bug 9218: fix intranet cart email for non english templates

Bug 9218: fix intranet cart email for non english templates

This patch adapts the method from OPAC to the staff interface (cf bug 8062).

Test plan:
- add somes notices to the cart
- try to send the cart by email
- the email should be the same as before
- translate templates and retry with another language. Before this patch,
  the email was empty. With this patch, it contains the list of records
  and items.

Signed-off-by: Paola Rossi <paola.rossi@cineca.it>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
Passes all tests and QA script.
Fixes quite a bad translation problem, tested with German templates
and umlauts in the message and records.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
(cherry picked from commit c4c5496ec656ee4745587b3cea239cc849d2c09a)
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>