Provide HTML-attribute LANG in multilanguage sharepoint site

I have to create a master page for Sharepoint and include t开发者_如何转开发he correct HTML-attribute lang (html lang="en" e.g.). What is the best way to do this? Is there a resource like <%$Resources:wss, multipages_direction_dir_value %> used for html:dir? I don't want to create custom code for this.

Yes, you can use language resources for that. If I'm not mistaken, this is how the default SharePoint master pages are written

In 2010 you have <%$Resources:wss,language_value%>

But there isn't any similar resource in the previous versions