Adding fields to language definition

[etherald]

At http://processwire.com/talk/topic/545-progress-on-processwire-22-and-overview-of-multi-language-support/ I read that I can add fields to the language template, but can't find anywhere to do that. Has this documentation been superseded? How is it possible to add fields to a language? I want to add image (for a flag) and contact info.

Also, why can't I edit a language from the list at Setup > Languages? I can only view the list or add a new language.

[Soma]

It's a special page, not a regular page you edit, with a system template "language". So you want to filter for "Show system templates" on the admin templates list or you don't see it.