Since nobody else has replied I will take a guess. I would first look at your environment variables. In particular I would look at the environment variables that start with the letters LC_. You can see what your shell session environment variables are using the following command.
printenv | sort | grep -i lc_
You can see that all of my LC_ variables are set to en_US. I don't know what other settings are available. Well, I mean that I don't know the effect of using other locale settings. You can find your system's locale options in the /usr/share/locale directory.
Hopefully that will get you started in the right direction even if it isn't a complete answer.