Common questions regarding languages are:
For any previously generated document (for example in English) iubenda allows you to add a translation in one of the available languages.
The translation will have the same information as the “original” version, except for any custom services/clauses that you may have written, which, as it was written by you, will have to be recreated by you for the new language. You may choose to use tools like DeepL or Google Translate to help you here (though we recommend that you consult with a native to make sure that the translations are ok).
Alternatively, you can add one or more languages to your documents on your site/app page (Dashboard > [your website]):
To remove one or more languages from your documents, go on your site/app page (Dashboard > [your website]), click on the language(s) you want to delete, then Remove: