Add authors taxonomy for blog posts (#435)

earnest

16.32.2020 e26616e170cb5db79b24c6e27a1f873a064429b5

 exampleSite/content/posts/dummy.pt-br.md

@@ -4,6 +4,7 @@
slug = "dummy" 
tags = ["hugo", "i18n"]
categories = ["blog"]
authors = ["Translation test"]
+++

Nada para ver aqui!