Hi there,
There is no option yet to localize the content in Muse.
If you would like to publish your site to business catalyst then creating different pages in the same Muse site is recommended.
Else, you can make a back up of this muse site and and create another site using this site, (save the same site with different name to another location) then open that one and edit text in site in another language, and then do the same for third language and so on.
Thanks.