support multiple teamleads in each team (#2702)

* fix jumping avatars
* fix line-break after color dot for long names

src/Voter/TeamVoter.php

@@ -65,6 +65,15 @@ final class TeamVoter extends Voter
             return false;
         }
 
+        switch ($attribute) {
+            case 'edit':
+            case 'delete':
+                // changing existing teams should be limited to admins and teamleads
+                if (!$user->isAdmin() && !$user->isSuperAdmin() && !$user->isTeamleadOf($subject)) {
+                    return false;
+                }
+        }
+
         return $this->permissionManager->hasRolePermission($user, $attribute . '_team');
     }
 }