User are afraid to set any browser setting. It would be better for them to choose the language through web page. You should also consider user may not be able

User are afraid to set any browser setting. It would be better for them to choose the language through web page. You should also consider user may not be able to switch the language of a public computer. The setting may be locked, or the operating system is in another language, e.g. Chinese, user doesn't even know where the "setting" button is.