After a little investigation, I've found I'm getting spanish statistics on my ISPConfig2 installation because of the following:
Code:
# cat /etc/environment
LANG=es_ES.UTF-8
/etc/environment is sourced by login and no login shells, so it's sourced too in cron jobs
So, if you want webalizer statistics to be generated in your language, just add a LANG definition to your locale into this file.