The List of "Member of groups" in Preferences and the user group in the right log should also make gender distinction.
You can give the username to the group-* messages and add to each message the GENDER parser function, when the message is used in the context of a user, if not in user context (like the drop down on Special:ListUsers), than give no username and the default is used.
Another fix is to check for group-*-female message and use that message, when the message is used in user context.
Thanks.
Version: 1.18.x
Severity: enhancement