Boot from the Knoppix livecd again. Use the following cheat code at the boot: prompt

knoppix lang=uk

When knoppix starts, most things should be localized to uk settings, including apps which you run from fluxbox. If you now make a persistent home directory, these settings will persist and you do not have to type in the cheat code the next time you boot and load the persistent home directory image.

See http://www.knoppix.net/wiki/Cheat_Codes for some details on cheat codes.

Regards.