2 Languages in 1 Blog post?

Thanks for your question:

Basically, in xili-language, one post = one language via the taxonomy language. (Remain that a post is an object containing title, content, excerpt, taxonomy, custom fields and more…)

If the post is multilingual, it is possible to define as undefined or with the main of the language.

If you want to insert a post inside a post, you can also use the plugin xili-postinpost and the shortcode tool.

All depend on your content strategy and navigation strategy in the website !