There is a value in the registry.
The question is - what is the correct value for English? Can someone check you can play in English?
In Win10, when you change the value, you can just type in "English." (including the period). It will translate it into hex or whatever automatically. T
his is the same value that is in there when you change the system language to english. However it changes the value to the system language every time you boot the game so changing the key is useless :(