This happened last year as well using pre-stage imaging. We image all our machines with a pre-stage that lays down some basics like office, kanaka plugin, admin accounts, etc. After imaging completes some of the machines randomly pick a different system Language. Sometimes it's French, Italian, Arabic, Catalan, etc. Most of the time it's English but not always.
Am I missing something in the pre-stage settings so it will always be English?