Enviroment value for system locale?

[krajis]

I might just miss something, but it seems I cannot get the system locale sorted out. So that decimal separator would be comma and thousand separator would be, well, nothing. On command line there seems not to be locale command available and Firefox does not seem to care about any site language or UI language preferences for this. So I can download for example language pack just fine, but locale stays as it is.

Could there be -e parameter for locale of the system?