Add cross-language links in the index template.

static/stylesheet/style.less

@@ -155,6 +155,18 @@ main {
     }
   }
 
+  header {
+    max-width: 760px;
+
+    .translations {
+      float: right;
+
+      .active {
+        font-weight: 600;
+      }
+    }
+  }
+
   article {
     margin: 0 8% 2% 8%;
 
@@ -167,14 +179,6 @@ main {
         color: @header-text-color;
         font-size: 0.86em;
       }
-
-      .translations {
-        float: right;
-
-        .active {
-          font-weight: 600;
-        }
-      }
     }
 
     code, kbd, samp, pre {

templates/index.html

@@ -12,6 +12,17 @@
   </script>
 {% endif %}
 
+<header>
+{% if extra_siteurls %}
+<div class="translations">
+    <a class="active" href="{{ articles_page.url }}">{{ DEFAULT_LANG }}</a>
+    {% for lang, url in extra_siteurls.items() %}
+      <a href="{{ url }}/{{ articles_page.url }}">{{ lang }}</a>
+    {% endfor %}
+  </div>
+{% endif %}
+</header>
+
 {% for article in articles_page.object_list %}
 <article>
   <header>