rel="alternate" hreflang tag should not exclude language of page itself. #41
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I watched a video below. Google says "hreflang should specify all alternates on eace page, including the page itself", but multilingual add-on does not.
Expanding your site to more languages (about 9:49)
http://www.youtube.com/watch?v=8ce9jv91beQ
https://support.google.com/webmasters/answer/189077
Multilingual sitemap already has alternates of all languages.