Hello. 

"I couldn't add social media buttons" - use one of social objects. For version 12, the process will be similar.

"and multiple languages" - it's harder than adding social media buttons. You need to create a copy of the project site and translate it into another language.Then, if desired, set up the Entry page. In the root folder of the main site (on hosting) you need to create a folder with a second language and upload the site there (in a second language).

P.S. In my paid video tutorials, I showed how exactly this can be done. But they considered the 17th version of the program.