CRM-13972 related fix

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* CRM-13972: Preferred Language reset after editing contact
  http://issues.civicrm.org/jira/browse/CRM-13972

CRM/Contact/Form/Edit/CommunicationPreferences.php

@@ -162,7 +162,9 @@ class CRM_Contact_Form_Edit_CommunicationPreferences {
   static function setDefaultValues(&$form, &$defaults) {
 
     if (!empty($defaults['preferred_language'])) {
-      $defaults['preferred_language'] = CRM_Core_PseudoConstant::getKey('CRM_Contact_DAO_Contact', 'preferred_language', $defaults['preferred_language']);
+      $defaults['preferred_language'] = CRM_Utils_Array::key($defaults['preferred_language'],
+        CRM_Contact_BAO_Contact::buildOptions('preferred_language')
+      );
     }
 
     // CRM-7119: set preferred_language to default if unset