FEATURE #1522: add orbit slider

Had to change some things in global widgets management and also in html code widget. Sorry for this ugly commit..

app/Widgets/Exceptions/WidgetExistsException.php

@@ -0,0 +1,14 @@
+<?php
+namespace App\Widgets\Exceptions;
+
+use Exception;
+
+class WidgetExistsException extends \Exception
+{
+    public function __construct($message = "", $code = 0, Exception $previous = null)
+    {
+        $message = trans('admin/widgets.widgetExists', ['id' => $message]);
+
+        parent::__construct($message, $code, $previous);
+    }
+}