discourse/app/assets/javascripts/admin/templates/email-preview-digest.hbs

<p>{{i18n 'admin.email.preview_digest_desc'}}</p>

<div class='admin-controls'>
  <div class='span7 controls'>
    <label for='last-seen'>{{i18n 'admin.email.last_seen_user'}}</label>
    {{date-picker-past value=lastSeen id="last-seen"}}
    <label>{{i18n 'admin.email.user'}}:</label>
    {{user-selector single="true" usernames=username}}
    <button class='btn' {{action "refresh"}}>{{i18n 'admin.email.refresh'}}</button>
    <div class="toggle">
      <label>{{i18n 'admin.email.format'}}</label>
      {{#if showHtml}}
        <span>{{i18n 'admin.email.html'}}</span> | <a href {{action "toggleShowHtml"}}>{{i18n 'admin.email.text'}}</a>
      {{else}}
        <a href {{action "toggleShowHtml"}}>{{i18n 'admin.email.html'}}</a> | <span>{{i18n 'admin.email.text'}}</span>
      {{/if}}
    </div>
  </div>
</div>

{{#conditional-loading-spinner condition=loading}}

<div class="email-preview-digest">
  {{#if showSendEmailForm}}
    <br/>
    <div class="controls">
      {{#if sendingEmail}}
        {{i18n 'admin.email.sending_test'}}
      {{else}}
        <label>{{i18n 'admin.email.send_digest_label'}}</label>
        {{text-field value=email placeholderKey="admin.email.test_email_address"}}
        <button class='btn' {{action "sendEmail"}} disabled={{sendEmailDisabled}}>{{i18n 'admin.email.send_digest'}}</button>
        {{#if sentEmail}}
          <span class='result-message'>{{i18n 'admin.email.sent_test'}}</span>
        {{/if}}
      {{/if}}
    </div>
    <br/>
  {{/if}}

  <div class="preview-output">
    {{#if showHtml}}
      {{#if htmlEmpty}}
        <p>{{i18n 'admin.email.no_result'}}</p>
      {{else}}
        <iframe src="{{iframeSrc}}" />
      {{/if}}
    {{else}}
      <pre>{{{model.text_content}}}</pre>
    {{/if}}
  </div>
</div>

{{/conditional-loading-spinner}}