Support querying sites by lang_id
|Reported by:||ocean90||Owned by:||jeremyfelt|
|Component:||Networks and Sites||Keywords:||has-patch has-unit-tests commit|
The wp_blogs table has a lang_id field and I don't see why we shouldn't support this field in WP_Site_Query.
WordPress.org has a separate table to store all locales with its data. By using WP_Site_Query we would benefit of the built-in query cache.