Support postfix HTML in addition to prefix HTML for navbar items

See https://gohugo.io/variables/menus/

layouts/partials/navbar.html

@@ -32,7 +32,9 @@
         {{ if .HasChildren }}
         <li class="dropdown">
           <a href="#" class="dropdown-toggle" data-toggle="dropdown" aria-haspopup="true">
-            {{ .Name }}
+            {{ .Pre }}
+            <span>{{ .Name }}</span>
+            {{ .Post }}
             <span class="caret"></span>
           </a>
           <ul class="dropdown-menu">
@@ -41,6 +43,7 @@
               <a href="{{ .URL | relLangURL }}"{{ if $.IsHome }} data-target="{{ .URL }}"{{ end }}>
                 {{ .Pre }}
                 <span>{{ .Name }}</span>
+                {{ .Post }}
               </a>
             </li>
             {{ end }}