If authors taxonomy is enabled, link to it in metadata

layouts/partials/post-metadata.html

@@ -27,7 +27,20 @@
     {{ with .Params.authors }}
     <span class="post-meta-item">
         {{ partial "icon.html" "user-circle" }}
+
+        {{ if index $.Site.Taxonomies "authors" }}
+
+        {{ $authors := slice }}
+        {{ range . }}
+        {{ $url := (printf "/authors/%s" (. | anchorize)) | absLangURL }}
+        {{ $authors = $authors | append (printf `<a href="%s">%s</a>` $url . | safeHTML) }}
+        {{ end }}
+        {{ delimit $authors ", " }}
+
+        {{ else }}
         {{ delimit . ", " }}
+
+        {{ end }}
     </span>
     {{ end }}