diff --git a/config/config.php b/config/config.php
index b3ecca7..45662e2 100644
--- a/config/config.php
+++ b/config/config.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * Pi Engine (http://pialog.org)
+ * Pi Engine (http://piengine.org)
  *
- * @link            http://code.pialog.org for the Pi Engine source repository
- * @copyright       Copyright (c) Pi Engine http://pialog.org
- * @license         http://pialog.org/license.txt New BSD License
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt New BSD License
  */
 
 /**
diff --git a/config/database.php b/config/database.php
index 581607c..7e1e7bf 100644
--- a/config/database.php
+++ b/config/database.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * Pi Engine (http://pialog.org)
+ * Pi Engine (http://piengine.org)
  *
- * @link            http://code.pialog.org for the Pi Engine source repository
- * @copyright       Copyright (c) Pi Engine http://pialog.org
- * @license         http://pialog.org/license.txt New BSD License
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt New BSD License
  */
 
 /**
diff --git a/config/module.php b/config/module.php
index 606c0b4..b551c9c 100644
--- a/config/module.php
+++ b/config/module.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * Pi Engine (http://pialog.org)
+ * Pi Engine (http://piengine.org)
  *
- * @link            http://code.pialog.org for the Pi Engine source repository
- * @copyright       Copyright (c) Pi Engine http://pialog.org
- * @license         http://pialog.org/license.txt New BSD License
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt New BSD License
  */
 
 /**
diff --git a/config/navigation.php b/config/navigation.php
index ff01165..2db1282 100644
--- a/config/navigation.php
+++ b/config/navigation.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * Pi Engine (http://pialog.org)
+ * Pi Engine (http://piengine.org)
  *
- * @link            http://code.pialog.org for the Pi Engine source repository
- * @copyright       Copyright (c) Pi Engine http://pialog.org
- * @license         http://pialog.org/license.txt New BSD License
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt New BSD License
  */
 
 /**
diff --git a/config/page.php b/config/page.php
index 6493c4e..5f360bb 100644
--- a/config/page.php
+++ b/config/page.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * Pi Engine (http://pialog.org)
+ * Pi Engine (http://piengine.org)
  *
- * @link            http://code.pialog.org for the Pi Engine source repository
- * @copyright       Copyright (c) Pi Engine http://pialog.org
- * @license         http://pialog.org/license.txt New BSD License
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt New BSD License
  */
 
 /**
diff --git a/config/permission.php b/config/permission.php
index 6949de0..8524399 100755
--- a/config/permission.php
+++ b/config/permission.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * Pi Engine (http://pialog.org)
+ * Pi Engine (http://piengine.org)
  *
- * @link            http://code.pialog.org for the Pi Engine source repository
- * @copyright       Copyright (c) Pi Engine http://pialog.org
- * @license         http://pialog.org/license.txt New BSD License
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt New BSD License
  */
 
 /**
diff --git a/config/route.php b/config/route.php
index 9ca5839..4d8807a 100644
--- a/config/route.php
+++ b/config/route.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * Pi Engine (http://pialog.org)
+ * Pi Engine (http://piengine.org)
  *
- * @link            http://code.pialog.org for the Pi Engine source repository
- * @copyright       Copyright (c) Pi Engine http://pialog.org
- * @license         http://pialog.org/license.txt New BSD License
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt New BSD License
  */
 
 /**
diff --git a/src/Api/Breadcrumbs.php b/src/Api/Breadcrumbs.php
index 068948d..bb91d40 100644
--- a/src/Api/Breadcrumbs.php
+++ b/src/Api/Breadcrumbs.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * Pi Engine (http://pialog.org)
+ * Pi Engine (http://piengine.org)
  *
- * @link            http://code.pialog.org for the Pi Engine source repository
- * @copyright       Copyright (c) Pi Engine http://pialog.org
- * @license         http://pialog.org/license.txt New BSD License
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt New BSD License
  */
 
 /**
diff --git a/src/Api/Notification.php b/src/Api/Notification.php
index d7b20c7..40be69e 100644
--- a/src/Api/Notification.php
+++ b/src/Api/Notification.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * Pi Engine (http://pialog.org)
+ * Pi Engine (http://piengine.org)
  *
- * @link            http://code.pialog.org for the Pi Engine source repository
- * @copyright       Copyright (c) Pi Engine http://pialog.org
- * @license         http://pialog.org/license.txt New BSD License
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt New BSD License
  */
 
 /**
diff --git a/src/Api/Project.php b/src/Api/Project.php
index 9e88d81..f1c64f9 100644
--- a/src/Api/Project.php
+++ b/src/Api/Project.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * Pi Engine (http://pialog.org)
+ * Pi Engine (http://piengine.org)
  *
- * @link            http://code.pialog.org for the Pi Engine source repository
- * @copyright       Copyright (c) Pi Engine http://pialog.org
- * @license         http://pialog.org/license.txt New BSD License
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt New BSD License
  */
 
 /**
@@ -70,7 +70,7 @@ public function canonizeProject($project)
             ));
             $project['user']['avatar'] = Pi::service('user')->avatar($project['user']['id'], 'large', array(
                 'alt' => $project['user']['name'],
-                'class' => 'img-responsive img-circle',
+                'class' => 'img-fluid rounded-circle',
             ));
             $project['user']['profileUrl'] = Pi::url(Pi::service('user')->getUrl('profile', array(
                 'id' => $project['user']['id'],
diff --git a/src/Api/Question.php b/src/Api/Question.php
index 02bef49..64f5939 100644
--- a/src/Api/Question.php
+++ b/src/Api/Question.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * Pi Engine (http://pialog.org)
+ * Pi Engine (http://piengine.org)
  *
- * @link            http://code.pialog.org for the Pi Engine source repository
- * @copyright       Copyright (c) Pi Engine http://pialog.org
- * @license         http://pialog.org/license.txt New BSD License
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt New BSD License
  */
 
 /**
@@ -78,7 +78,7 @@ public function canonizeQuestion($question)
         ));
         $question['user']['avatar'] = Pi::service('user')->avatar($question['user']['id'], 'large', array(
             'alt' => $question['user']['name'],
-            'class' => 'img-responsive img-circle',
+            'class' => 'img-fluid rounded-circle',
         ));
         $question['user']['profileUrl'] = Pi::url(Pi::service('user')->getUrl('profile', array(
             'id' => $question['user']['id'],
diff --git a/src/Api/Search.php b/src/Api/Search.php
index b3526fd..16e14ee 100644
--- a/src/Api/Search.php
+++ b/src/Api/Search.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * Pi Engine (http://pialog.org)
+ * Pi Engine (http://piengine.org)
  *
- * @link            http://code.pialog.org for the Pi Engine source repository
- * @copyright       Copyright (c) Pi Engine http://pialog.org
- * @license         http://pialog.org/license.txt New BSD License
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt New BSD License
  */
 
 /**
diff --git a/src/Controller/Admin/IndexController.php b/src/Controller/Admin/IndexController.php
index 3c953ed..9d33bf5 100644
--- a/src/Controller/Admin/IndexController.php
+++ b/src/Controller/Admin/IndexController.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * Pi Engine (http://pialog.org)
+ * Pi Engine (http://piengine.org)
  *
- * @link            http://code.pialog.org for the Pi Engine source repository
- * @copyright       Copyright (c) Pi Engine http://pialog.org
- * @license         http://pialog.org/license.txt New BSD License
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt New BSD License
  */
 
 /**
diff --git a/src/Controller/Admin/ProjectController.php b/src/Controller/Admin/ProjectController.php
index 91cf907..5cdda04 100644
--- a/src/Controller/Admin/ProjectController.php
+++ b/src/Controller/Admin/ProjectController.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * Pi Engine (http://pialog.org)
+ * Pi Engine (http://piengine.org)
  *
- * @link            http://code.pialog.org for the Pi Engine source repository
- * @copyright       Copyright (c) Pi Engine http://pialog.org
- * @license         http://pialog.org/license.txt New BSD License
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt New BSD License
  */
 
 /**
diff --git a/src/Controller/Admin/QuestionController.php b/src/Controller/Admin/QuestionController.php
index 9e90f22..22f7144 100644
--- a/src/Controller/Admin/QuestionController.php
+++ b/src/Controller/Admin/QuestionController.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * Pi Engine (http://pialog.org)
+ * Pi Engine (http://piengine.org)
  *
- * @link            http://code.pialog.org for the Pi Engine source repository
- * @copyright       Copyright (c) Pi Engine http://pialog.org
- * @license         http://pialog.org/license.txt New BSD License
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt New BSD License
  */
 
 /**
diff --git a/src/Controller/Feed/IndexController.php b/src/Controller/Feed/IndexController.php
index 16007b7..0dbaf0d 100644
--- a/src/Controller/Feed/IndexController.php
+++ b/src/Controller/Feed/IndexController.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * Pi Engine (http://pialog.org)
+ * Pi Engine (http://piengine.org)
  *
- * @link            http://code.pialog.org for the Pi Engine source repository
- * @copyright       Copyright (c) Pi Engine http://pialog.org
- * @license         http://pialog.org/license.txt New BSD License
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt New BSD License
  */
 
 /**
diff --git a/src/Controller/Front/AnswerController.php b/src/Controller/Front/AnswerController.php
index 3f06a42..38291c9 100644
--- a/src/Controller/Front/AnswerController.php
+++ b/src/Controller/Front/AnswerController.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * Pi Engine (http://pialog.org)
+ * Pi Engine (http://piengine.org)
  *
- * @link            http://code.pialog.org for the Pi Engine source repository
- * @copyright       Copyright (c) Pi Engine http://pialog.org
- * @license         http://pialog.org/license.txt New BSD License
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt New BSD License
  */
 
 /**
diff --git a/src/Controller/Front/IndexController.php b/src/Controller/Front/IndexController.php
index 3c34d0f..f398347 100644
--- a/src/Controller/Front/IndexController.php
+++ b/src/Controller/Front/IndexController.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * Pi Engine (http://pialog.org)
+ * Pi Engine (http://piengine.org)
  *
- * @link            http://code.pialog.org for the Pi Engine source repository
- * @copyright       Copyright (c) Pi Engine http://pialog.org
- * @license         http://pialog.org/license.txt New BSD License
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt New BSD License
  */
 
 /**
diff --git a/src/Controller/Front/ProjectController.php b/src/Controller/Front/ProjectController.php
index ac5122c..94c98af 100644
--- a/src/Controller/Front/ProjectController.php
+++ b/src/Controller/Front/ProjectController.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * Pi Engine (http://pialog.org)
+ * Pi Engine (http://piengine.org)
  *
- * @link            http://code.pialog.org for the Pi Engine source repository
- * @copyright       Copyright (c) Pi Engine http://pialog.org
- * @license         http://pialog.org/license.txt New BSD License
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt New BSD License
  */
 
 /**
diff --git a/src/Controller/Front/QuestionController.php b/src/Controller/Front/QuestionController.php
index 3fb2aff..6dd573b 100644
--- a/src/Controller/Front/QuestionController.php
+++ b/src/Controller/Front/QuestionController.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * Pi Engine (http://pialog.org)
+ * Pi Engine (http://piengine.org)
  *
- * @link            http://code.pialog.org for the Pi Engine source repository
- * @copyright       Copyright (c) Pi Engine http://pialog.org
- * @license         http://pialog.org/license.txt New BSD License
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt New BSD License
  */
 
 /**
diff --git a/src/Controller/Front/SubmitController.php b/src/Controller/Front/SubmitController.php
index a6945ab..8aaac8d 100644
--- a/src/Controller/Front/SubmitController.php
+++ b/src/Controller/Front/SubmitController.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * Pi Engine (http://pialog.org)
+ * Pi Engine (http://piengine.org)
  *
- * @link            http://code.pialog.org for the Pi Engine source repository
- * @copyright       Copyright (c) Pi Engine http://pialog.org
- * @license         http://pialog.org/license.txt New BSD License
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt New BSD License
  */
 
 /**
diff --git a/src/Controller/Front/TagController.php b/src/Controller/Front/TagController.php
index 61c977e..a68cc07 100644
--- a/src/Controller/Front/TagController.php
+++ b/src/Controller/Front/TagController.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * Pi Engine (http://pialog.org)
+ * Pi Engine (http://piengine.org)
  *
- * @link            http://code.pialog.org for the Pi Engine source repository
- * @copyright       Copyright (c) Pi Engine http://pialog.org
- * @license         http://pialog.org/license.txt New BSD License
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt New BSD License
  */
 
 /**
diff --git a/src/Form/AnswerFilter.php b/src/Form/AnswerFilter.php
index 96ed17b..8868dec 100644
--- a/src/Form/AnswerFilter.php
+++ b/src/Form/AnswerFilter.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * Pi Engine (http://pialog.org)
+ * Pi Engine (http://piengine.org)
  *
- * @link            http://code.pialog.org for the Pi Engine source repository
- * @copyright       Copyright (c) Pi Engine http://pialog.org
- * @license         http://pialog.org/license.txt New BSD License
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt New BSD License
  */
 
 /**
diff --git a/src/Form/AnswerForm.php b/src/Form/AnswerForm.php
index dc30418..4059b06 100644
--- a/src/Form/AnswerForm.php
+++ b/src/Form/AnswerForm.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * Pi Engine (http://pialog.org)
+ * Pi Engine (http://piengine.org)
  *
- * @link            http://code.pialog.org for the Pi Engine source repository
- * @copyright       Copyright (c) Pi Engine http://pialog.org
- * @license         http://pialog.org/license.txt New BSD License
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt New BSD License
  */
 
 /**
diff --git a/src/Form/AskFilter.php b/src/Form/AskFilter.php
index a07826e..817764d 100644
--- a/src/Form/AskFilter.php
+++ b/src/Form/AskFilter.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * Pi Engine (http://pialog.org)
+ * Pi Engine (http://piengine.org)
  *
- * @link            http://code.pialog.org for the Pi Engine source repository
- * @copyright       Copyright (c) Pi Engine http://pialog.org
- * @license         http://pialog.org/license.txt New BSD License
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt New BSD License
  */
 
 /**
diff --git a/src/Form/AskForm.php b/src/Form/AskForm.php
index cb84b8d..c9a73ed 100644
--- a/src/Form/AskForm.php
+++ b/src/Form/AskForm.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * Pi Engine (http://pialog.org)
+ * Pi Engine (http://piengine.org)
  *
- * @link            http://code.pialog.org for the Pi Engine source repository
- * @copyright       Copyright (c) Pi Engine http://pialog.org
- * @license         http://pialog.org/license.txt New BSD License
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt New BSD License
  */
 
 /**
diff --git a/src/Form/Element/Project.php b/src/Form/Element/Project.php
index 46e5ee8..e53caa7 100644
--- a/src/Form/Element/Project.php
+++ b/src/Form/Element/Project.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * Pi Engine (http://pialog.org)
+ * Pi Engine (http://piengine.org)
  *
- * @link            http://code.pialog.org for the Pi Engine source repository
- * @copyright       Copyright (c) Pi Engine http://pialog.org
- * @license         http://pialog.org/license.txt New BSD License
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt New BSD License
  */
 
 /**
diff --git a/src/Form/ProjectFilter.php b/src/Form/ProjectFilter.php
index 8bb8356..37bba6b 100644
--- a/src/Form/ProjectFilter.php
+++ b/src/Form/ProjectFilter.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * Pi Engine (http://pialog.org)
+ * Pi Engine (http://piengine.org)
  *
- * @link            http://code.pialog.org for the Pi Engine source repository
- * @copyright       Copyright (c) Pi Engine http://pialog.org
- * @license         http://pialog.org/license.txt New BSD License
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt New BSD License
  */
 
 /**
diff --git a/src/Form/ProjectForm.php b/src/Form/ProjectForm.php
index cc295bd..8a02382 100644
--- a/src/Form/ProjectForm.php
+++ b/src/Form/ProjectForm.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * Pi Engine (http://pialog.org)
+ * Pi Engine (http://piengine.org)
  *
- * @link            http://code.pialog.org for the Pi Engine source repository
- * @copyright       Copyright (c) Pi Engine http://pialog.org
- * @license         http://pialog.org/license.txt New BSD License
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt New BSD License
  */
 
 /**
diff --git a/src/Form/UpdateFilter.php b/src/Form/UpdateFilter.php
index 85c8965..3dc0de3 100644
--- a/src/Form/UpdateFilter.php
+++ b/src/Form/UpdateFilter.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * Pi Engine (http://pialog.org)
+ * Pi Engine (http://piengine.org)
  *
- * @link            http://code.pialog.org for the Pi Engine source repository
- * @copyright       Copyright (c) Pi Engine http://pialog.org
- * @license         http://pialog.org/license.txt New BSD License
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt New BSD License
  */
 
 /**
diff --git a/src/Form/UpdateForm.php b/src/Form/UpdateForm.php
index 078cbaf..bdb5d48 100644
--- a/src/Form/UpdateForm.php
+++ b/src/Form/UpdateForm.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * Pi Engine (http://pialog.org)
+ * Pi Engine (http://piengine.org)
  *
- * @link            http://code.pialog.org for the Pi Engine source repository
- * @copyright       Copyright (c) Pi Engine http://pialog.org
- * @license         http://pialog.org/license.txt New BSD License
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt New BSD License
  */
 
 /**
diff --git a/src/Model/Project.php b/src/Model/Project.php
index 2ff16ac..5842af9 100644
--- a/src/Model/Project.php
+++ b/src/Model/Project.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * Pi Engine (http://pialog.org)
+ * Pi Engine (http://piengine.org)
  *
- * @link            http://code.pialog.org for the Pi Engine source repository
- * @copyright       Copyright (c) Pi Engine http://pialog.org
- * @license         http://pialog.org/license.txt New BSD License
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt New BSD License
  */
 
 /**
diff --git a/src/Model/Question.php b/src/Model/Question.php
index 9f4e2ae..81eade9 100644
--- a/src/Model/Question.php
+++ b/src/Model/Question.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * Pi Engine (http://pialog.org)
+ * Pi Engine (http://piengine.org)
  *
- * @link            http://code.pialog.org for the Pi Engine source repository
- * @copyright       Copyright (c) Pi Engine http://pialog.org
- * @license         http://pialog.org/license.txt New BSD License
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt New BSD License
  */
 
 /**
diff --git a/src/Route/Ask.php b/src/Route/Ask.php
index 9e61526..180aa9a 100644
--- a/src/Route/Ask.php
+++ b/src/Route/Ask.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * Pi Engine (http://pialog.org)
+ * Pi Engine (http://piengine.org)
  *
- * @link            http://code.pialog.org for the Pi Engine source repository
- * @copyright       Copyright (c) Pi Engine http://pialog.org
- * @license         http://pialog.org/license.txt New BSD License
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt New BSD License
  */
 
 /**
diff --git a/src/Validator/SlugDuplicate.php b/src/Validator/SlugDuplicate.php
index eed8dfa..e490aec 100644
--- a/src/Validator/SlugDuplicate.php
+++ b/src/Validator/SlugDuplicate.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * Pi Engine (http://pialog.org)
+ * Pi Engine (http://piengine.org)
  *
- * @link            http://code.pialog.org for the Pi Engine source repository
- * @copyright       Copyright (c) Pi Engine http://pialog.org
- * @license         http://pialog.org/license.txt New BSD License
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt New BSD License
  */
 
 /**
diff --git a/template/admin/project-index.phtml b/template/admin/project-index.phtml
index 38ed609..2ed280c 100644
--- a/template/admin/project-index.phtml
+++ b/template/admin/project-index.phtml
@@ -2,7 +2,7 @@
 <div class="clearfix">
     <?php if (!empty($projects)) { ?>
         <h3><?php _e('List of projects') ?></h3>
-        <table id="project-list" class="table table-striped table-bordered table-condensed">
+        <table id="project-list" class="table table-striped table-bordered table-sm">
             <tr>
                 <th><?php _e('ID'); ?></th>
                 <th><?php _e('Title'); ?></th>
@@ -22,8 +22,8 @@
                     </td>
                     <td><?php echo $this->escape($project['title']); ?></td>
                     <td>
-                        <a class="btn btn-success btn-xs" title="<?php _e('View'); ?>" href="<?php echo $project['projectUrl']; ?>"><i class="fa fa-eye"></i> <?php _e('View'); ?></a>
-                        <a class="btn btn-primary btn-xs" title="<?php _e('Edit'); ?>" href="<?php echo $this->url('', array(
+                        <a class="btn btn-success btn-sm" title="<?php _e('View'); ?>" href="<?php echo $project['projectUrl']; ?>"><i class="fa fa-eye"></i> <?php _e('View'); ?></a>
+                        <a class="btn btn-primary btn-sm" title="<?php _e('Edit'); ?>" href="<?php echo $this->url('', array(
                             'action' => 'update',
                             'id' => $project['id'])); ?>"><i class="fa fa-pencil-square-o"></i> <?php _e('Edit'); ?></a>
                     </td>
@@ -31,8 +31,8 @@
             <?php } ?>
         </table>
         <p>
-            <span class="label label-success"><?php _e('Published'); ?></span>
-            <span class="label label-warning"><?php _e('Pending review'); ?></span>
+            <span class="badge badge-success"><?php _e('Published'); ?></span>
+            <span class="badge badge-warning"><?php _e('Pending review'); ?></span>
         </p>
     <?php } else { ?>
         <div class="alert alert-danger" role="alert">
diff --git a/template/admin/question-index.phtml b/template/admin/question-index.phtml
index 060ece1..655e75b 100644
--- a/template/admin/question-index.phtml
+++ b/template/admin/question-index.phtml
@@ -9,7 +9,7 @@ $this->js($this->assetModule('script/system-msg.js', 'system'));
 <div class="clearfix">
     <?php if (!empty($questions)) { ?>
         <h3><?php _e('List of questions and answers') ?></h3>
-        <table id="question-list" class="table table-striped table-bordered table-condensed">
+        <table id="question-list" class="table table-striped table-bordered table-sm">
             <tr>
 
                 <th class="col-md-6"><?php _e('Title'); ?></th>
@@ -50,19 +50,19 @@ $this->js($this->assetModule('script/system-msg.js', 'system'));
                     <td>
                         <?php if ($question['status'] == 1) { ?>
                             <button id="button-<?php echo $question['id']; ?>" type="button"
-                                    class="btn btn-warning btn-xs" data-toggle="button"
+                                    class="btn btn-warning btn-sm" data-toggle="button"
                                     data-link="<?php echo $this->url('', array('action' => 'accept', 'id' => $question['id'], 'status' => '2')); ?>">
                                 <i class="fa fa-times"></i> <?php _e('Reject'); ?></button>
                         <?php } elseif ($question['status'] == 2) { ?>
                             <button id="button-<?php echo $question['id']; ?>" type="button"
-                                    class="btn btn-success btn-xs" data-toggle="button"
+                                    class="btn btn-success btn-sm" data-toggle="button"
                                     data-link="<?php echo $this->url('', array('action' => 'accept', 'id' => $question['id'], 'status' => '1')); ?>">
                                 <i class="fa fa-check"></i> <?php _e('Accept'); ?></button>
                         <?php } ?>
-                        <a class="btn btn-primary btn-xs" title="<?php _e('Edit'); ?>"
+                        <a class="btn btn-primary btn-sm" title="<?php _e('Edit'); ?>"
                            href="<?php echo $this->url('', array('action' => 'update', 'id' => $question['id'])); ?>"><i
                                     class="fa fa-pencil-square-o"></i> <?php _e('Edit'); ?></a>
-                        <a class="btn btn-danger btn-xs" title="<?php _e('Delete'); ?>"
+                        <a class="btn btn-danger btn-sm" title="<?php _e('Delete'); ?>"
                            href="<?php echo $this->url('', array('action' => 'delete', 'id' => $question['id'])); ?>"><i
                                     class="fa fa-trash-o"></i> <?php _e('Delete'); ?></a>
                     </td>
@@ -71,8 +71,8 @@ $this->js($this->assetModule('script/system-msg.js', 'system'));
         </table>
         <div class="paginator"><?php echo $this->paginationControl($paginator, 'Sliding', 'paginator'); ?></div>
         <p>
-            <span class="label label-success"><?php _e('Published'); ?></span>
-            <span class="label label-warning"><?php _e('Pending review'); ?></span>
+            <span class="badge badge-success"><?php _e('Published'); ?></span>
+            <span class="badge badge-warning"><?php _e('Pending review'); ?></span>
         </p>
     <?php } else { ?>
         <div class="alert alert-danger" role="alert"><?php _e('No question submit yet'); ?></div>
@@ -86,13 +86,13 @@ $this->js($this->assetModule('script/system-msg.js', 'system'));
             $.getJSON($(this).attr("data-link")).done(function (result) {
                 if (result.ajaxstatus == 1) {
                     if (result.questionstatus == 1) {
-                        var labelClass = 'label label-success';
-                        var buttonClass = 'btn btn-warning btn-xs disabled';
+                        var labelClass = 'badge badge-success';
+                        var buttonClass = 'btn btn-warning btn-sm disabled';
                         var buttonText = '<i class="fa fa-trash-o"></i> <?php _e("Reject"); ?>';
                     }
                     if (result.questionstatus == 2) {
-                        var labelClass = 'label label-warning';
-                        var buttonClass = 'btn btn-success btn-xs disabled';
+                        var labelClass = 'badge badge-warning';
+                        var buttonClass = 'btn btn-success btn-sm disabled';
                         var buttonText = '<i class="fa fa-check"></i> <?php _e("Accept"); ?>';
                     }
                     $('#label-' + result.id).attr('class', labelClass);
diff --git a/template/front/answer-index.phtml b/template/front/answer-index.phtml
index 306bb1d..ecafcec 100644
--- a/template/front/answer-index.phtml
+++ b/template/front/answer-index.phtml
@@ -10,7 +10,7 @@
             <?php if ($question['main_image']) { ?>
                 <div class="clearfix thumbnail">
                     <div class="clearfix text-center">
-                        <img class="img-responsive" src="<?php echo Pi::api('doc','media')->getSingleLinkUrl($question['main_image'])->thumb('medium'); ?>">
+                        <img class="img-fluid" src="<?php echo Pi::api('doc','media')->getSingleLinkUrl($question['main_image'])->thumb('medium'); ?>">
                     </div>
                 </div>
             <?php } ?>
@@ -28,7 +28,7 @@
         </div>
     </div>
     <br />
-    <div class="well">
+    <div class="card card-body bg-light mb-3">
         <?php echo $this->form($form, 'vertical'); ?>
     </div>
 </div>
\ No newline at end of file
diff --git a/template/front/project-list.phtml b/template/front/project-list.phtml
index e4d8ed7..5b5bda1 100644
--- a/template/front/project-list.phtml
+++ b/template/front/project-list.phtml
@@ -10,7 +10,7 @@
                     <?php if ($project['main_image']) { ?>
                         <div class="media-left col-md-3">
                             <a title="<?php echo $this->escape($project['title']); ?>" href="<?php echo $project['projectUrl']; ?>">
-                                <img class="img-responsive media-object" src="<?php echo Pi::api('doc','media')->getSingleLinkUrl($project['main_image'])->thumb('thumbnail'); ?>">
+                                <img class="img-fluid media-object" src="<?php echo Pi::api('doc','media')->getSingleLinkUrl($project['main_image'])->thumb('thumbnail'); ?>">
                             </a>
                         </div>
                     <?php } ?>
diff --git a/template/front/question-list.phtml b/template/front/question-list.phtml
index 4ec0f2e..a9dba31 100644
--- a/template/front/question-list.phtml
+++ b/template/front/question-list.phtml
@@ -26,11 +26,11 @@
                 <?php if ($project['main_image']) { ?>
                     <div class="clearfix thumbnail">
                         <div class="clearfix text-center">
-                            <img class="img-responsive" src="<?php echo Pi::api('doc','media')->getSingleLinkUrl($project['main_image'])->thumb('medium'); ?>">
+                            <img class="img-fluid" src="<?php echo Pi::api('doc','media')->getSingleLinkUrl($project['main_image'])->thumb('medium'); ?>">
                         </div>
                     </div>
                 <?php } ?>
-                <div class="btn-group btn-group-justified">
+                <div class="btn-group d-flex">
                     <a class="btn btn-success" title="<?php _e('Ask question'); ?>" href="<?php echo Pi::url($this->url('', array(
                         'controller' => 'submit',
                         'action' => 'index',
@@ -50,7 +50,7 @@
             <h1 class="pull-left"><?php echo $this->escape($title); ?></h1>
             <?php if ($config['question_ask']) { ?>
                 <p class="pull-right">
-                    <a class="btn btn-primary btn-xs" title="<?php _e('Ask question'); ?>" href="<?php echo Pi::url($this->url('', array(
+                    <a class="btn btn-primary btn-sm" title="<?php _e('Ask question'); ?>" href="<?php echo Pi::url($this->url('', array(
                         'controller' => 'submit',
                         'action' => 'index'
                     ))); ?>"><?php _e('Ask question'); ?></a>
@@ -67,18 +67,18 @@
                 <div class="col-md-2">
                     <div class="question-single-information">
                         <ul class="list-inline">
-                            <li class="text-center">
+                            <li class="list-inline-item text-center">
                                 <?php echo _number($question['answer']) ?>
                                 <br />
                                 <?php _e('Answer'); ?>
                             </li>
-                            <li class="text-center">
+                            <li class="list-inline-item text-center">
                                 <?php echo _number($question['hits']) ?>
                                 <br />
                                 <?php _e('View'); ?>
                             </li>
                             <?php if ($config['vote_bar']) { ?>
-                                <li class="text-center">
+                                <li class="list-inline-item text-center">
                                     <?php echo _number($question['point']) ?>
                                     <br />
                                     <?php _e('Vote'); ?>
@@ -100,10 +100,10 @@
                     </div>
                     <div class="question-single-time">
                         <ul class="list-inline pull-right small">
-                            <li><?php _e('On'); ?></li>
-                            <li><?php echo $this->escape($question['time_create_view']); ?></li>
-                            <li><?php _e('By'); ?></li>
-                            <li><?php echo $this->escape($question['user']['name']); ?></li>
+                            <li class="list-inline-item"><?php _e('On'); ?></li>
+                            <li class="list-inline-item"><?php echo $this->escape($question['time_create_view']); ?></li>
+                            <li class="list-inline-item"><?php _e('By'); ?></li>
+                            <li class="list-inline-item"><?php echo $this->escape($question['user']['name']); ?></li>
                         </ul>
                     </div>
                 </div>
diff --git a/template/front/question-single.phtml b/template/front/question-single.phtml
index 8cfe1ce..99c2898 100644
--- a/template/front/question-single.phtml
+++ b/template/front/question-single.phtml
@@ -19,7 +19,7 @@
                 <?php if ($question['main_image']) { ?>
                     <div class="clearfix thumbnail">
                         <div class="clearfix text-center">
-                            <img class="img-responsive" src="<?php echo Pi::api('doc','media')->getSingleLinkUrl($question['main_image'])->thumb('medium'); ?>">
+                            <img class="img-fluid" src="<?php echo Pi::api('doc','media')->getSingleLinkUrl($question['main_image'])->thumb('medium'); ?>">
                         </div>
                     </div>
                 <?php } ?>
@@ -30,7 +30,7 @@
                     </ul>
                 <?php } ?>
                 <?php if ($question['status'] == 2 && $userIsManager) { ?>
-                    <div class="btn-group btn-group-justified">
+                    <div class="btn-group d-flex">
                         <a class="btn btn-success" title="<?php _e('Confirm'); ?>" href="<?php echo Pi::url($this->url('', array(
                             'controller' => 'question',
                             'action'     => 'review',
@@ -106,7 +106,7 @@
                                 <li class="list-group-item"><i class="fa fa-clock-o"></i> <?php _e('Time'); ?>: <?php echo $this->escape($answer['time_create_view']); ?></li>
                             </ul>
                             <?php if ($answer['status'] == 2 && $userIsManager) { ?>
-                                <div class="btn-group btn-group-justified">
+                                <div class="btn-group d-flex">
                                     <a class="btn btn-success" title="<?php _e('Confirm'); ?>" href="<?php echo Pi::url($this->url('', array(
                                         'controller' => 'question',
                                         'action'     => 'review',
@@ -144,7 +144,7 @@
         </div>
     <?php } ?>
     <?php if ($config['question_answer'] && $question['status'] == 1) { ?>
-        <div class="btn-group btn-group-justified" role="group">
+        <div class="btn-group d-flex" role="group">
             <a class="btn btn-success" title="<?php _e('Answer'); ?>" href="<?php echo Pi::url($this->url('', array(
                 'controller' => 'answer',
                 'action' => 'index',
diff --git a/template/front/tag_list.phtml b/template/front/tag_list.phtml
index 826a3d4..549fc44 100644
--- a/template/front/tag_list.phtml
+++ b/template/front/tag_list.phtml
@@ -6,7 +6,7 @@
 	<?php if (isset($tagList) && !empty($tagList)) { ?>
 	<div class="tagList clearfix">
 		<?php foreach($tagList as $tag) { ?>
-		<div class="well well-small col-md-3">
+		<div class="card card-body bg-light mb-3 col-md-3">
 			<a title="<?php echo $this->escape($tag['term']); ?>" href="<?php echo $this->escape($tag['url']); ?>">
 				<i class="fa fa-tag"></i> <?php echo $this->escape($tag['term']); ?> ( <?php echo $this->escape($tag['count']); ?> )
 			</a>