BugFix activate tab-pane for page view

lib/views/widget/page_content.html

@@ -22,7 +22,7 @@
       <script type="text/template" id="raw-text-original">{{ revision.body.toString() | encodeHTML }}</script>
 
       {# formatted text #}
-      <div class="tab-pane" id="revision-body">
+      <div class="tab-pane active" id="revision-body">
         <div class="revision-toc" id="revision-toc">
           <a data-toggle="collapse" data-parent="#revision-toc" href="#revision-toc-content" class="revision-toc-head">{{ t('Table of Contents') }}</a>
           <div id="revision-toc-content" class="revision-toc-content collapse in"></div>