Add Support for i18n taxonomy for `tags`

closes: #876

layouts/_default/single.html

@@ -36,13 +36,12 @@
   {{- end }}
 
   <footer class="post-footer">
-    {{- if .Params.tags }}
+    {{- $tags := .Language.Params.Taxonomies.tag | default "tags" }}
     <ul class="post-tags">
-      {{- range ($.GetTerms "tags") }}
+      {{- range ($.GetTerms $tags) }}
       <li><a href="{{ .Permalink }}">{{ .LinkTitle }}</a></li>
       {{- end }}
     </ul>
-    {{- end }}
     {{- if (.Param "ShowPostNavLinks") }}
     {{- partial "post_nav_links.html" . }}
     {{- end }}