Default language!

Hi!

I have installed swedish language and it is working greate!
If a sound file is missing the english is the one it will use.

But now I have added my own language files and in my dialplan
i’m using them with:

exten => 8000,7,Set(CHANNEL(language)=myown_se)

and it is working pretty nice!

If I send the call to voicemail that is in a different context,
it started to speek english!
Why did it change to english, I have swedish as default!?

How can I do to have myown_se lang files and if a file is missing
(or something else) it checks the swedish lang files and if it is
missing there also it can use the english?