Revert "Rewrite login template."

This reverts commit 06a9a564.

biscuit/core/templates/two_factor/login.html

-{# -*- engine:django -*- #}
-{% extends "core/base.html" %}
-{% load bootstrap4 i18n %}
-
-{% block content %}
- {% if next %}
-  {% if user.is_authenticated %}
-   <p>
-    Your account doesn't have access to this page. To proceed,
-    please login with an account that has access.
-   </p>
-  {% else %}
-   <p>Please login to see this page.</p>
-  {% endif %}
- {% endif %}
-
- <form method="post" action="{% url 'two_factor:login' %}">
-  {% csrf_token %}
-  {% bootstrap_form form %}
-  <button type="submit" class="btn btn-dark">
-    {% blocktrans %}Login{% endblocktrans %}
-  </button>
- </form>
-{% endblock %}