[Risolto] Divi Builder remain in English language

Background of the issue:
I am trying to keep the Divi Builder in the English language on my website link nascosto. I have followed the settings as explained on the forum but they don't work.

Symptoms:
The Divi Builder remains in the English language despite following the forum's settings.

Questions:
How can I ensure the Divi Builder stays in English?
Why don't the forum settings work for keeping the Divi Builder in English?