discourse/app/assets/javascripts/admin/addon/components/admin-form-row.hbs

<div class="form-element label-area">
  {{#if this.label}}
    <label>{{i18n this.label}}</label>
  {{else}}
    &nbsp;
  {{/if}}
</div>
<div class="form-element input-area">
  {{#if this.wrapLabel}}
    <label>{{yield}}</label>
  {{else}}
    {{yield}}
  {{/if}}
</div>