Nezir Dzanko

I am looking for a way to let users update their preferred language from the help center profile page.
While that works fine for the active session, it is not possible to let an end user set its default locale, so that it would reflect in support as well:

According to the User API the users have a locale property which should be editable. 
However, the User Object in Zendesk Help Center does not expose that property for editing.

Is there a way to let the end user edit his default locale / preferred language?

Thanks in advance!