Adding lang field in wp_posts table

[anasr]

Suppose that you have an English blog, and you want to publish a new post in a different language, say Arabic for example. In this case you need to set the lang attribute to Arabic, like this:

<article lang="ar">

... since the html tag originally says:

<html lang="en">

Currently, how could you do that?
The only way —I guess— is to enclose the post-content in a div, like this:

<div lang="ar">
...
</div>

Whilst, this lang attribute should be assigned to article tag.
Notice also the language of article > header contents still defined as English.

[johnbillion]

Thanks for the report, anasr.

Multilingual support isn't something that we're planning for core, but we do have a discussion group that's actively researching and discussing the ways in which WordPress can help the various multilingual plugins. This will hopefully help enable this sort of functionality.

More info ​here and ​here.