When i replace english to my language i cant open object. in english it always say "You cannot open it".

You have "buka" for both open and unlock. And the "can't XXXX" message is the same for both as well, which made things a bit confusing at first. It's running the unlock code instead of open when you type something like "buka kulkas", and your "kulkas" is not unlockable.

Another note: if you provide a GetDefaultPrefix function in your Indonesia file, then you can get rid of the English.aslx include. It would be something like:

  <function name="GetDefaultPrefix" type="string" parameters="obj">
    return ("some prefix based on the object")
  </function>

Oh, so that's what make quest confused.
and i will try your code.
Thanks.