rename .html templates to .jinja2 for more consistency

templates/history.html

@@ -1,33 +0,0 @@
-{% extends "base.html" %}
-
-{% block title %}Page history - {{ app_name }}{% endblock %}
-
-{% block meta %}
-<meta name="robots" content="noindex,nofollow" />
-{% endblock %}
-
-{% block content %}
-<h1 id="firstHeading">{{ p.title }}</h1>
-<div class="preview-subtitle">Page history</div>
-
-<ul>
-{% for rev in history %}
-  <li>
-    <a href="/history/revision/{{ rev.id }}/">
-      #{{ rev.id }}
-      &middot;
-      {{ rev.pub_date.strftime("%B %-d, %Y %H:%M:%S") }}
-      {% if rev.comment %}
-      “{{ rev.comment }}”
-      {% endif %}
-    </a>
-    by
-    <a href="/u/{{ rev.user.username }}">
-      {{ rev.user.username }}
-    </a>
-  </li>
-{% endfor %}
-</ul>
-
-<p>{{ T("back-to") }} <a href="{{ p.get_url() }}">{{ p.title }}</a>.</p>
-{% endblock %}