Add category description (merge and modify pull-request #692)

app/Template/board/index.php

@@ -1,7 +1,7 @@
 <section id="main">
 
     <?= $this->render('board/filters', array(
-        'categories' => $categories,
+        'categories' => $categories_listing,
         'users' => $users,
         'project' => $project,
     )) ?>
@@ -9,7 +9,8 @@
     <?= $this->render('board/show', array(
             'project' => $project,
             'swimlanes' => $swimlanes,
-            'categories' => $categories,
+            'categories_listing' => $categories_listing,
+            'categories_description' => $categories_description,
             'board_private_refresh_interval' => $board_private_refresh_interval,
             'board_highlight_period' => $board_highlight_period,
     )) ?>