login.html

{% extends "base.html" %}
{% load i18n bootstrap4 %}

{% block title %}{% trans "Log in" %} · {{ block.super }}{% endblock %}

{% block content %}
    <form method="post" action="{% url 'login' %}">
        {% for error in form.non_field_errors %}
            <p class="alert alert-danger" role="alert">{{ error }}</p>
        {% endfor %}

        {% csrf_token %}

        {% bootstrap_field form.username %}
        {% bootstrap_field form.password %}

        <input type="submit" class="btn btn-primary" value="{% trans 'Login' %}" />
        <input type="hidden" name="next" value="{{ next }}" />
    </form>
{% endblock %}