feedback addressed

course_discovery/static/js/publisher/comparing-objects.js

 $(document).on('click', '.btn-show-changes', function (e) {
 
-    if ($(this).text() === 'Show changes') {
+    if ($(this).hasClass('show')){
         $('.field-container').each(function () {
             showDiff($(this).find('span.object'), $(this).find('span.history-object'), $(this).find('span.show-diff'));
         });
-        $(this).text('Hide changes');
+        $(this).removeClass('show');
     } else {
         $('.object').show();
         $('.show-diff').hide();
-        $(this).text('Show changes');
+        $(this).addClass('show');
     }
 });
 

course_discovery/static/sass/publisher/publisher.scss

@@ -912,7 +912,7 @@ select {
   }
 
   .hr-line {
-    float: left;
+    @include float(left);
     width: 882px;
   }
 

course_discovery/templates/publisher/course_revision_history.html

@@ -2,6 +2,7 @@
 {% load i18n %}
 {% load staticfiles %}
 {% load compress %}
+
 {% block title %}
   {% trans "Revision History" %}
 {% endblock title %}
@@ -17,7 +18,7 @@
             {{ date }} by {{ name }}
           {% endblocktrans %}
         {% endwith %}
-        <button class="btn-show-changes">Show changes</button>
+        <button class="btn-show-changes show">{% trans "Show changes" %}</button>
       </p>
     </div>