routing: Fix breakages with routing on some versions of Python. Finally figured what happened with change 6baa94da8b16 (this is a Mercurial hash by the way if you're looking at the Git mirror). Between Python 3.6 and 3.7 there was a change where the percent sign ('%') went from being escaped by `re.escape` to _not_ being escaped. So now we need to use different regex patterns dependin on the Python version, yay.

{% extends "default.html" %}

{% block content %}
<div class="container" id="content">
    <div class="row">
        <section class="col-md-8">
        {{ content|safe }}
        </section>
        <aside class="col-md-4">
            {% include 'inc/family-sidebar.html' %}
        </aside>
    </div>
</div>
{% endblock %}