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.

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

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

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