Não consigo alterar os ícones de notificação

[Mikhail_Tyuftyaev]

E onde posso ver como eles se parecem?

@Don

const REPLACEMENTS = {
            "d-tracking": "bell",
            "d-muted": "discourse-bell-slash",
            "d-regular": "far-bell",
            "d-watching": "discourse-bell-exclamation",
            "d-watching-first": "discourse-bell-one",
            "d-drop-expanded": "caret-down",
            "d-drop-collapsed": "caret-right",
            "d-unliked": "far-heart",
            "d-liked": "heart",
            "notification.mentioned": "at",