--- a/cms/app-client/app/models/document.js	Sun Oct 09 11:44:18 2016 +0200
+++ b/cms/app-client/app/models/document.js	Tue Oct 11 02:49:59 2016 +0200
@@ -7,7 +7,7 @@
     uri: DS.attr('string'),
     issued: DS.attr('date'),
     title: DS.attr('string'),
-    language: DS.attr('string'),
+    language: DS.attr({ defaultValue: function() { return []; } }),
     publisher: DS.attr('string'),
     transcript_url: DS.attr('string'),
     transcript: DS.attr({ defaultValue: function() { return {}; } }),