What determines the help center language that users see?

Question

I have a customer who sees a different translated version of the help center depending on whether they access help center from a computer or a mobile device. What determines the language of the help center that the end user sees?

Answer 

Many variables play a role in determining what language an end user sees when they access your Help Center. The variables are based on specific locales that the user's browser or device presents to Zendesk at the time the user accesses your site. The variables are listed below in order of preference:

1. url_locale
2. session_locale
3. user_locale
4. preferred_browser_locale
5. compatible_browser_locale

Note: compatible_browser_locale is determined by a Ruby gem that Zendesk uses to make an estimated guess about which of help center's available locales is closest to the browser’s preferred locale.