change terminal language os x

I have a Mountain Lion macbook and it's default locale is english, it's keyboard is english (US) as well. I need to change the language that the terminal replies to Swedish.

For example, Instead of replying "Connection Refused" for a failed telnet, it should say "Forbindelse Vagras" (which is the Swedish translation)

EDIT: I have tried setting LANG=sv_SE.UTF-8 and same with LC_ALL, to no effect

Have also tried changing system-wide settings, which changes the language in the entire system but not the terminal

Also, I'm running ZSH.

Solution 1:

I imagine you'll want to set the LANG environment variable.