discourse/app/assets/javascripts/discourse/templates/modal/history.js.handlebars

<div class="modal-body">

  {{#if loading}}
    {{i18n loading}}
  {{else}}
    {{#if versions}}
      <div class='span8'>

        {{view Ember.Select
          contentBinding="versions"
          optionLabelPath="content.description"
          optionValuePath="content.number"
          selectionBinding="versionLeft"}}

        <div class='contents'>
          {{#if postLeft}}
            {{{postLeft.cooked}}}
          {{else}}
            <div class='history-loading'>{{i18n loading}}</div>
          {{/if}}
        </div>

      </div>

      <div class='span8 offset1'>
        {{view Ember.Select
          contentBinding="versions"
          optionLabelPath="content.description"
          optionValuePath="content.number"
          selectionBinding="versionRight"}}

        {{#if postRight.edit_reason}}
          <p><strong>{{i18n post.edit_reason}}</strong>{{postRight.edit_reason}}</p>
        {{/if}}

        <div class='contents'>
          {{#if diff}}
            {{{diff}}}
          {{else}}
            <div class='history-loading'>{{i18n loading}}</div>
          {{/if}}
        </div>

      </div>
    {{/if}}
  {{/if}}

</div>