Hey there,

Yes.

You will need to install the language pack that you want for EasyBlog on its language listing page as shown in the screenshot. https://monosnap.com/file/u8evcWEFsX3KLfaBaDbqaaqgTCiGdz

Once you set the language in Joomla, EasyBlog will automatically inherit the language that is set on the site.

Does EasyBlog support item assigns?
I mean: specific blog post in English has assigned posts in Spanish, French, Italian etc.

Do you mean post association in EasyBlog?

If yes, you can take a look at the screenshot on how to do the post association on the composer for an example. https://monosnap.com/file/bJWYsFXahNZPLgdj3qYm9jCOTxngKz