Fix activity page load more button appearance

framework/core/js/forum/src/components/ActivityPage.js

@@ -50,7 +50,7 @@ export default class ActivityPage extends UserPage {
         <div className="ActivityPage-loadMore">
           {Button.component({
             children: app.trans('core.load_more'),
-            className: 'Button--default',
+            className: 'Button',
             onclick: this.loadMore.bind(this)
           })}
         </div>

framework/core/less/forum/ActivityPage.less

@@ -1,6 +1,10 @@
-.ActivityPage-loadMore .LoadingIndicator {
+.ActivityPage-loadMore {
+  text-align: center;
+
+  .LoadingIndicator {
     height: 46px;
   }
+}
 .ActivityPage-list {
   border-left: 3px solid @control-bg;
   list-style: none;