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Reports that a UE4 project launched on French or German Windows 7 is not automatically correctly setting the culture from the OS' setting.
Can probably install French or German support for a copy of Windows 7 installed in English, but I'm not sure if that's the exactly the same environment as buying a French or German copy of Windows 7 to begin with.
Have not been able to test here do to lack of French / German Windows 7
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-32657 in the post.