Access check fix in contacts/ajax/activation.php

plus small cleanup

apps/contacts/ajax/activation.php

@@ -10,18 +10,16 @@
 require_once ("../../../lib/base.php");
 OC_JSON::checkLoggedIn();
 OC_JSON::checkAppEnabled('contacts');
-$l=new OC_L10N('contacts');
 
 $bookid = $_POST['bookid'];
+$book = OC_Contacts_App::getAddressbook($bookid);// is owner access check
+
 if(!OC_Contacts_Addressbook::setActive($bookid, $_POST['active'])) {
-	OC_JSON::error(array('data' => array('message' => $l->t('Error (de)activating addressbook.'))));
 	OC_Log::write('contacts','ajax/activation.php: Error activating addressbook: '.$bookid, OC_Log::ERROR);
+	OC_JSON::error(array('data' => array('message' => OC_Contacts_App::$l10n->t('Error (de)activating addressbook.'))));
 	exit();
 }
-$book = OC_Contacts_App::getAddressbook($bookid);
-
 
-/* is there an OC_JSON::error() ? */
 OC_JSON::success(array(
 	'active' => OC_Contacts_Addressbook::isActive($bookid),
 	'bookid' => $bookid,