[Closed] Your default language, English, must be mapped to a supported language in order to use automatic tra...

Background of the issue:
I'm trying to make an automatic translation using WPML, but it doesn't work. The issue can be seen on this page: hidden link. I expected to see the result as shown here: hidden link.

Symptoms:
The default language, English, must be mapped to a supported language in order to use automatic translation. Instead of the expected result, I got this: hidden link.

Questions:
Why doesn't the automatic translation work?
How can I map English to a supported language for automatic translation?