I use a Japanese Windows XP computer, with the locale set to Japanese, not English.
However, I cannot read Japanese, so I always use English programs where possible.
I cannot change my system locale, because it is required for most of the things I do. So it is necessary for ZoneAlarm to accommodate this by providing a command line option or a menu option or some other way of setting my preference for ZoneAlarm that overrides the system locale.
Sooooooo many localized programs fail in this very important way. It's quite frustrating.