I noticed that EGW reports this error
/egroupware/api/js/offline/themes/offline-language-it.css:1 Failed to load resource: the server responded with a status of 404 (Not Found)
I can’t figure out if something is missing in the installation or if I need to modify something.
No, you’re missing nothing.
The offline.js version, we have bundled, does not include Italian translation.
The current version does, so we need to update it (@hadi.nategh, if possible via npm or composer).
so if I understand correctly, an update will be made available?