Bug 33882: Add spans in dateofbirth column on member.tt

Bug 33882: Add spans in dateofbirth column on member.tt

To test:
1 Apply patch
2 Do a patron search that will return multiple patrons.
3 Look at the date of birth column and notice the text is now wrapped in a class called 'dateofbirth'
4. Notice that the age hint is wrapped in a class called 'agehint'.
5. Add '.agehint { display: none }' to intranetusercss.
6. Now notice the date of birth still displays but no age information.

Signed-off-by: Sam Lau <samalau@gmail.com>
Signed-off-by: David Cook <dcook@prosentient.com.au>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>