Adding a group to a team spams invalid requests for avatars and status on activity and display names are not shown

[nickvergessen]

Screen 1

• Team owner: Mention bubble with "You", should either be your full name, or no mention bubble
• Members: Group ID is shown instead of the display name

Screen 2

• Activity icon is black
• "Member" is rendered as a user even when it's a group (seems to be steaming from

  circles/lib/Activity/ProviderSubjectCircleMember.php

  Lines 36 to 38 in 5f33b46

  	'member' => $this->generateUserParameter($member),
  	'external' => $this->generateExternalMemberParameter($member),
  	'group' => $this->generateGroupParameter($member),

  )
• Group display name is not used