[Risolto] Wrong redirection

Background of the issue:
I exported the site link nascosto to this new site link nascosto. The original site was using English/Spanish/French/Portuguese/German. The new site will use Spanish/Basque/Catalan/Galego. I cleaned everything, removing all the references to the previous languages, leaving just Spanish.

Symptoms:
There is a message saying that there are still some translations to removed languages. The home page is redirected to nueva-acropolis.net/es that does not exist. In some places, it still shows text in English, but my main language is Spanish.

Questions:
How can I completely remove references to the previous languages?
Why is the home page redirected to nueva-acropolis.net/es and how can I fix it?
How can I ensure that all text is displayed in Spanish?