input(xmlui): added attributes argument to create: specific attributes can be used of named widget (for some widget converted to <input> only so far). The argument is a dict from widget name to a sub dict containing the keyword arguments. The next dict_ext filter is used.

{% extends 'error/base.html' %}

{% block body %}
<h1>{% trans %}Unauthorized{% endtrans %}</h1>
<p>{% trans %}Sorry, you are not allowed to access this page.{% endtrans %}</p>
{% endblock body %}