Hello @Artem_Pylypchuk ,
Yes, multilingual versions can exist at example.com and example.com/de/. However there are some constraints.
In fact, I recently released a theme, https://crimson.themeupstudio.com/, with which you can experience a truly multilingual experience with a Ghost theme.
Read more about it in my forum post [UPDATE] Crimson: A Multilingual Ghost blog theme for seamless multi language experience - #3 by themeupstudio
Message me in case of any queries.