Approval.

kn/eventtype_groups.php

@@ -0,0 +1,8 @@
+<?PHP
+declare(strict_types = 1);
+$eventtype_groups = array (
+  'production' => 'Production',
+  'post_production' => 'Post-production',
+  'pre_production' => 'Pre-production',
+  'no_production' => 'No production',
+);