Fix polymorphic comments in supervisor dashboard
Fix polymorphic comments in supervisor dashboard

michaelem/rgsoc-teams,rails-girls-summer-of-code/rgsoc-teams,rails-girls-summer-of-code/rgsoc-teams,TeamCheesy/rgsoc-teams,TeamCheesy/rgsoc-teams,michaelem/rgsoc-teams,TeamCheesy/rgsoc-teams,rails-girls-summer-of-code/rgsoc-teams,michaelem/rgsoc-teams