Bug 11944: Fix encoding on sending emails

Bug 11944: Fix encoding on sending emails

This patch fixes 2 places where mails were badly encoded:
1/ At the opac and the intranet, on sending baskets
2/ At the opac and the intranet, on sending shelf/list

Test plan:
Shelf/List:
- Create a list with non-latin characters in the name.
- Add some items containing non-latin characters in their content.
- Send the list by email

Basket/Cart:
- Add some items containing non-latin characters in their content to
  your cart..
- Send the cart by email

Signed-off-by: Paola Rossi <paola.rossi@cineca.it>
Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Signed-off-by: Dobrica Pavlinusic <dpavlin@rot13.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>