Arabic font issue fixed

Author: MuhammadRiyaz

src/Silverpop/EngagePod.php

@@ -731,6 +731,8 @@ private function _httpPost($fields) {
         curl_setopt($ch,CURLOPT_POST,count($fields));
         curl_setopt($ch,CURLOPT_POSTFIELDS,$fields_string);
         curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
+        curl_setopt($ch,CURLOPT_HTTPHEADER,array (
+   "Content-Type: application/x-www-form-urlencoded; charset=utf-8" ));
 
         //execute post
         $result = curl_exec($ch);