Display which blocklist is responsible for a block

[jfb]

Closed to existing feature request here:

Shows which blocklist the domain name is blocked from

Hi everyone! I think there is a good idea: Shows which blocklist the domain name is blocked from. So at present, we cannot see the blocked domain is blocked from which blocklist, we can only see that the domain is blocked by blocklists. By add this function, we can see which blocklist the domain name is blocked from.