Add group admin profiles

And other fixes

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/graphql/schema/discussions/comment.ex

@@ -33,6 +33,7 @@ defmodule Mobilizon.GraphQL.Schema.Discussions.CommentType do
     field(:inserted_at, :datetime)
     field(:updated_at, :datetime)
     field(:deleted_at, :datetime)
+    field(:published_at, :datetime)
   end
 
   @desc "The list of visibility options for a comment"