added migration to convert table to utf8; fixed table name with prefix

src/migrations/m161118_101348_alter_charset_to_utf8.php

+<?php
+
+use yii\db\Migration;
+
+class m161118_101348_alter_charset_to_utf8 extends Migration
+{
+    public function up()
+    {
+        Yii::$app->db->createCommand("ALTER TABLE {{%hrzg_widget_content}} CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci ;")
+            ->execute();
+        Yii::$app->db->createCommand("ALTER TABLE {{%hrzg_widget_template}} CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci ;")
+            ->execute();
+    }
+
+    public function down()
+    {
+        echo "m160721_101347_alter_charset_to_utf8 cannot be reverted.\n";
+
+        return false;
+    }
+}

src/models/crud/base/Widget.php

@@ -34,7 +34,7 @@ abstract class Widget extends \yii\db\ActiveRecord
      */
     public static function tableName()
     {
-        return 'app_hrzg_widget_content';
+        return '{{%hrzg_widget_content}}';
     }
 
     /**

src/models/crud/base/WidgetTemplate.php

@@ -21,7 +21,7 @@ abstract class WidgetTemplate extends \yii\db\ActiveRecord
      */
     public static function tableName()
     {
-        return 'app_hrzg_widget_template';
+        return '{{%hrzg_widget_template}}';
     }
 
     /**