Voicemail email body with a user defined language

I have users with english and french language.
I can setup the language in the sip.conf file.
But for the voicemail support, I would like to personalize the subjet and body mail message by the user mother thongue.
I try differnet solution but no one is working.
Any body can help me ?
Best regards and many thanks for your help. Asterisk is a very nice product !

define a custom mailcmd that runs a script in the programming language of your choice and craft the email there.