Bug 26311: (follow-up) loop through the patron with date of birth and in categories...

Bug 26311: (follow-up) loop through the patron with date of birth and in categories having age limits

Also added category limits in message, for example (12-18)

Check patron :
- with no date of birth
- with invalid age in category having age required
- with invalid age in category having upper age limit
- with invalid age in category having age required and upper age limit

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>