I think i noticed a bug, or at least a fault.
in the language files at line 73 until 81 there is listed the language dutch (nederlands) as NL,
but in the install.php (line 332) and in db_defs.sql (line 13) there is no option for NL.
So there is no dutch audio language in the database and there for not choose-able in the edit movie page.
I don't know if this is meant to be or that it is a mistake or fault