discourse/app/assets/javascripts/discourse/templates/modal/history.hbs

<div class="modal-body">
  <div>
    <div id="revision-controls">
      <button title="{{i18n 'post.revisions.controls.first'}}" {{bind-attr class=":btn :standard :no-text displayGoToFirst::invisible" disabled=loading}} {{action "loadFirstVersion"}}><i class="fa fa-fast-backward"></i></button>
      <button title="{{i18n 'post.revisions.controls.previous'}}" {{bind-attr class=":btn :standard :no-text displayGoToPrevious::invisible" disabled=loading}} {{action "loadPreviousVersion"}}><i class="fa fa-backward"></i></button>
      <div id="revision-numbers" {{bind-attr class="displayRevisions::invisible"}}>
        {{#conditional-loading-spinner condition=loading size="small"}}
          {{boundI18n revisionsTextKey previousBinding="previousVersion" currentBinding="current_version" totalBinding="version_count"}}
        {{/conditional-loading-spinner}}
      </div>
      <button title="{{i18n 'post.revisions.controls.next'}}" {{bind-attr class=":btn :standard :no-text displayGoToNext::invisible" disabled=loading}} {{action "loadNextVersion"}}><i class="fa fa-forward"></i></button>
      <button title="{{i18n 'post.revisions.controls.last'}}" {{bind-attr class=":btn :standard :no-text displayGoToLast::invisible" disabled=loading}} {{action "loadLastVersion"}}><i class="fa fa-fast-forward"></i></button>
      {{#if displayHide}}
        <button title="{{i18n 'post.revisions.controls.hide'}}" {{bind-attr class=":btn :standard :no-text :btn-danger" disabled=loading}} {{action "hideVersion"}}><i class="fa fa-trash-o"></i></button>
      {{/if}}
      {{#if displayShow}}
        <button title="{{i18n 'post.revisions.controls.show'}}" {{bind-attr class=":btn :standard :no-text" disabled=loading}} {{action "showVersion"}}><i class="fa fa-undo"></i></button>
      {{/if}}
    </div>
    <div id="display-modes">
      <button {{bind-attr class=":btn displayingInline:btn-primary:standard"}} title="{{i18n 'post.revisions.displays.inline.title'}}" {{action "displayInline"}}>{{{i18n 'post.revisions.displays.inline.button'}}}</button>
      {{#unless site.mobileView}}
        <button {{bind-attr class=":btn displayingSideBySide:btn-primary:standard"}} title="{{i18n 'post.revisions.displays.side_by_side.title'}}" {{action "displaySideBySide"}}>{{{i18n 'post.revisions.displays.side_by_side.button'}}}</button>
        <button {{bind-attr class=":btn displayingSideBySideMarkdown:btn-primary:standard"}} title="{{i18n 'post.revisions.displays.side_by_side_markdown.title'}}" {{action "displaySideBySideMarkdown"}}>{{{i18n 'post.revisions.displays.side_by_side_markdown.button'}}}</button>
      {{/unless}}
    </div>
  </div>
  <div id="revision-details">
    <i class="fa fa-pencil"></i>
    {{#link-to 'user' username}}
      {{bound-avatar-template content.avatar_template "small"}} {{username}}
    {{/link-to}}
    <span class="date">{{bound-date created_at}}</span>
    {{#if edit_reason}}
      &mdash; <span class="edit-reason">{{edit_reason}}</span>
    {{/if}}
    {{#unless site.mobileView}}
      {{#if user_changes}}
        &mdash; {{bound-avatar-template user_changes.previous.avatar_template "small"}} {{user_changes.previous.username}}
        &rarr; {{bound-avatar-template user_changes.current.avatar_template "small"}} {{user_changes.current.username}}
      {{/if}}
      {{#if wiki_changes}}
        &mdash; {{disabled-icon icon="pencil-square-o" secondary=wikiDisabled}}
      {{/if}}
      {{#if post_type_changes}}
        &mdash; {{disabled-icon icon="shield" disabled=postTypeDisabled}}
      {{/if}}
      {{#if category_id_changes}}
        &mdash; {{{previousCategory}}} &rarr; {{{currentCategory}}}
      {{/if}}
    {{/unless}}
  </div>
  <div id="revisions" {{bind-attr class="hiddenClasses"}}>
    {{#if title_changes}}
      <div class="row">
        <h2>{{{titleDiff}}}</h2>
      </div>
    {{/if}}
    {{#if site.mobileView}}
      {{#if user_changes}}
        <div class="row">
          {{bound-avatar-template user_changes.previous.avatar_template "small"}} {{user_changes.previous.username}}
          &rarr; {{bound-avatar-template user_changes.current.avatar_template "small"}} {{user_changes.current.username}}
        </div>
      {{/if}}
      {{#if wiki_changes}}
        <div class="row">
          {{disabled-icon icon="pencil-square-o" secondary=wikiDisabled}}
        </div>
      {{/if}}
      {{#if post_type_changes}}
        <div class="row">
          {{disabled-icon icon="shield" disabled=postTypeDisabled}}
        </div>
      {{/if}}
      {{#if category_id_changes}}
        <div class="row">
          {{{previousCategory}}} &rarr; {{{currentCategory}}}
        </div>
      {{/if}}
    {{/if}}

    {{plugin-outlet "post-revisions"}}

    <div class="row">
      {{{bodyDiff}}}
    </div>
  </div>
</div>