Correctly handle setting cluster 'updated' value when managing groups

[carrolp]

• Correctly handle setting cluster 'updated' value when managing groups (i.e. dont)
• Fix how groups are removed from a cluster
  • use uuid matching rather than full-object matching so it will match even if the group object in mongo has a _id attribute (which it does during test execution -- just using the uuid makes it more robust)
• Fix tests that are updating groups on a single cluster to expect a single modified record
• Update translation files (by npm run lint)