discourse/app/assets/javascripts/admin/addon/templates/customize-email-templates-edit.hbs

<ComboBox @value={{this.emailTemplate.id}} @content={{this.adminCustomizeEmailTemplates.sortedTemplates}} @onChange={{this.adminCustomizeEmailTemplates.onSelectTemplate}} @nameProperty="title" />

<div class="email-template">
  <label>{{i18n "admin.customize.email_templates.subject"}}</label>
  {{#if this.hasMultipleSubjects}}
    <h3><LinkTo @route="adminSiteText" @query={{hash q=this.hasMultipleSubjects}}>{{i18n "admin.customize.email_templates.multiple_subjects"}}</LinkTo></h3>
  {{else}}
    <Input @value={{this.buffered.subject}} />
  {{/if}}
  <br>

  <label>{{i18n "admin.customize.email_templates.body"}}</label>
  <DEditor @value={{this.buffered.body}} />

  <SaveControls @model={{this.emailTemplate}} @action={{action "saveChanges"}} @saved={{this.saved}} @saveDisabled={{this.saveDisabled}}>
    {{#if this.emailTemplate.can_revert}}
      <DButton @action={{action "revertChanges"}} @label="admin.customize.email_templates.revert" />
    {{/if}}
  </SaveControls>
</div>