by Alex Zappa on WordPress.org
This plugin slice the language attribute for HTML tag, For example: lang="en-US" to lang="en"

Before plugin activated
The lang attribute specifies the language of the element’s content.
Common examples are “en” for English, “es” for Spanish, “fr” for French, and so on.
This plugin slice the language attribute for HTML tag, For example: lang=”en-US” to lang=”en”