Hello,
I already asked a similar question a long time ago, but because of lack of time I didn't supply what you asked for.
I use SP pagebuilder Pro 3.8.10 in Joomla 4 installation.
My client is french, but no way to add french language to SP Pagebuilder.
In backend the language installation page is not showing any language to install. The pages is well displayed, but no list of languages.
In other websites I add have french language installed but editor and SP menu items stay in english.
I have the impression I'm doing something wrong.
I prefer by far the SP 3.8.10 version, the most stable for the moment.
Kind regards
Oscar