Hmm. Then it is a per server setting and not a per user setting. Right?
Um.. no. Each process has it's own environment, there's not one LANG environment variable, but one per process.
It should in my opinion be a normal SA configuration settings.
I for one disagree since nearly every other unix application in the world uses LANG it makes sense to be consistent with the defacto standards.
Creating our own setting merely breaks expected behavior.