Support article translation

templates/article.html

@@ -13,6 +13,8 @@
 {% block content %}
 <article class="single">
   <header>
+    {% import 'partial/translations.html' as translations with context %}
+    {{ translations.translations_for(article) }}
     <h1 id="{{ article.slug }}">{{ article.title }}</h1>
     <p>
       {{ _('Posted on %(when)s in %(category)s',

templates/page.html

@@ -5,6 +5,8 @@
 {% block content %}
 <article class="single">
   <header>
+    {% import 'partial/translations.html' as translations with context %}
+    {{ translations.translations_for(page) }}
     <h1 id="{{ page.slug }}">{{ page.title }}</h1>
   </header>
   <div>

templates/partial/translations.html

@@ -0,0 +1,10 @@
+{% macro translations_for(article) %}
+{% if article.translations %}
+<div class="translations">
+<span class="lang lang-current">{{article.lang}}</span>
+{% for translation in article.translations %}
+	<a class="lang" href="{{ SITEURL }}/{{ translation.url }}">{{ translation.lang }}</a>
+{% endfor %}
+</div>
+{% endif %}
+{% endmacro %}