Bug 22561: Forgotten password requirements hint doesn't list all rules for new passwords

Bug 22561: Forgotten password requirements hint doesn't list all rules for new passwords

This patch modifies a few templates in the OPAC so that all available
information on password requirements is displayed for each case where
the patron is setting a password:

 - If the RequireStrongPassword system preference is set, a message
   should appear listing strong password requirements and minimum
   password length.
 - If RequireStrongPassword is not set, the message should only ask for
   a minimum password length.

To test, apply the patch and enable the PatronSelfRegistration and
OpacResetPassword preferences.

On the following pages, test with RequireStrongPassword both on and
off. The correct messages should appear.

 - OPAC -> Forgot password. Follow the process to reset your password
   until you reach the step where you are entering the new password.
 - OPAC -> Register here. Check the password section of the registration
   form.
 - OPAC -> Log in -> Change your password.

Signed-off-by: Liz Rea <wizzyrea@gmail.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>