In search try to create a new set. On set name enter text that is in a language other than English.
in app/lib/ca/BaseFindController.php line 638
", "_", $vs_set_name), 0, 100)
will convert the text to "_"
In the second time will not be open because "set code" already exists
Change it to $t_set->set('set_code', $vs_set_name); the system will add num to the "_" and let the user to create the set.