[Закрытые] standard language url

Hi, in your documentation i see:

Different languages in directories
When you enable languages in directories, you’re telling WPML to arrange translations in what looks like different virtual folders. For example:

скрытая ссылка
скрытая ссылка
скрытая ссылка

Is it possible that the standard language, which in our case is NL will be displayed at

Example.com/nl/ instead of example.com?

my client wants every language to be a /nl/, /en/, /de/ etc.