fix(article): use loclate_date attribute instead of hardcoding the da…

…te format

Fix #552

templates/article.html

@@ -115,7 +115,7 @@ <h1>{{ title }}</h1>
             {% if article.date %}
             <h4>Published</h4>
             {% set day = article.date.strftime('%d')|int %}
-            <time itemprop="dateCreated" datetime="{{ article.date.isoformat() }}">{{ article.date.strftime('%b') }} {{ day }} {{- article.date.strftime(', %Y') }}</time>
+            <time itemprop="dateCreated" datetime="{{ article.date.isoformat() }}">{{ article.locale_date }}</time>
             {% endif %}
             {% include '_includes/last_updated.html' %}
             {% include '_includes/series.html' %}