message: read receipts: improve tooltips to show names of users
diff: "Preview": "Preview",
  "View": "View",
  "Join": "Join",
  + "%(members)s and more": "%(members)s and more",
  + "%(members)s and %(last)s": "%(members)s and %(last)s",
  "Seen by %(count)s people|other": "Seen by %(count)s people",
  "Seen by %(count)s people|one": "Seen by %(count)s person",
  "Recently viewed": "Recently viewed",
  