Suppose that if you change the location, that should change. Since mathworks.com automatically detects the location and selects the language respectively.
Are you able to change the environment settings on your computer? I'm not aware of a way to change the environment just for MATLAB on Windows besides the system-wide options as given in the documentation.
You can also select a web site from the following list:
How to Get Best Site Performance
Select the China site (in Chinese or English) for best site performance. Other MathWorks country sites are not optimized for visits from your location.