publications: Fix pub type link in multilingual mode (#232)

layouts/publication/single.html

@@ -34,7 +34,7 @@
         <div class="col-xs-12 col-sm-3 pub-row-heading">{{ i18n "publication_type" }}</div>
         <div class="col-xs-12 col-sm-9">
           {{ range $index, $pubtype := .Params.publication_types }}
-          <a href="{{ "/publication/" | relURL }}#{{ . | urlize }}">
+          <a href="{{ "/publication/" | relLangURL }}#{{ . | urlize }}">
             {{ index $.Site.Params.publication_types (int .) }}
           </a>
           {{ end }}