Bug 37141 makes it possible to register a message group with Translate. Translate has a feature that allows grouping one or more message groups into an aggregate group. This makes it easy for translators to translate or maintain multiple groups, without having to switch message groups all the time.
When a message group is added to Translate, CN should create an aggregate group for a campaign, if it does not exist already, and add the newly created message group to it. This will allow translators to be more efficient.