Bug 26266: Add jQuery validator to opac-password-recovery.tt

Bug 26266: Add jQuery validator to opac-password-recovery.tt

To test:
0) Activate password reset in system preferences.
1) Initiate a password recovery.
2) Try to submit with an invalid password.
3) Confirm that validation occurs.
4) Try to submit with mismatching passwords.
5) Confirm that validation occurs.
6) Sign off.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>