Password reset page does not localize according to the browser

Our app is using the New Universal Login experience, and supports multiple languages. However, the change password page from the email link would not switch to the browser specified language. I confirmed that our tenant > settings are up-to-dated with the selected languages. I confirmed my browser has the Accept-Language HTTP header set to a non-English language, e.g.

Accept-Language: ja;q=0.6

Am I missing anything? or do we have to customize the page like the classic login experience (Set the language of the change password widget in the classic universal login experience) too? Any suggestion.
Thanks and appreciated.