When viewing a client, blacklist, or domain, The group membership widget will either display the name of 1 group, or it will tell you the number of groups selected. It would be very helpful if it would actually give you the names of the groups when there are more than one.
E.g., instead of "3 selected" It would be preferable to see "(3) Group1, Group2, Group3".
Or, if the list really is too long, then truncate with an ellipsis "(6) Group1, Group2, Group3, Group4, Gro..."
Seems like it would be a localized change.