Thank you for your comment @bashadow.
an auto translation of post would be great
This is not a core issue but rather a front-end feature. It can already be achieved by installing the Google Translate extension if you use a Chrome desktop browser. Of course, it would be nice to have it fully integrated into front-ends.
I actually like the side by side bi-lingual post.
Side-by-side is OK when you only have one translation, but not very reader-friendly on mobile. If you are targeting more languages, this is not a solution.
As things at the foundation level settle down, I think it will make it easier for the front ends. I don't use mobile very often, so Yeah things like the side by side bilingual post are something I don't see on my mobile phone. pretty much still a desktop die hard here.