I have done a couple of factory resets on my Android phone but have never experienced iit reverting to Chinese language or the touch screen stopping to work. The reason why there is a factory reset is to make the product revert back to its default settings. I don't think that all phones would revert back to being Chinese and all (unless the phone was programmed to be Chinese in the first place and it is the default setting.
If you are still having some doubts, just go to an expert.
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