discourse/app/assets/javascripts/admin/addon/templates/config-look-and-feel-themes.hbs

<DBreadcrumbsItem
  @path="/admin/config/look-and-feel/themes"
  @label={{i18n "admin.config_areas.look_and_feel.themes.title"}}
/>

<AdminConfigAreas::LookAndFeelThemes @themes={{this.model}} />