fix linter errors

Fix the sorting
Save the sorting state
Remove unnecessary filter
Add support for grid view

cps/templates/list.html

@@ -18,6 +18,17 @@
         <button class="btn btn-success char">{{char.char}}</button>
         {% endfor %}
       </div>
+
+        <!-- View selection -->
+        <div class="btn-group">
+          <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
+            View <span class="caret"></span>
+          </button>
+          <ul class="dropdown-menu">
+            <li><a class="update-view" href="#" data-target="series_view" data-view="grid">{{_('Grid')}}</a></li>
+            <li><a class="update-view" href="#"  data-target="series_view" data-view="list">{{_('List')}}</a></li>
+          </ul>
+        </div>
     </div>
   <div class="container">
     <div id="list" class="col-xs-12 col-sm-6">