login.html

{% if loginfail == 'show' %}
    <div class="alert alert-danger text-center alert-dismissible fade show" role="alert">
        {% trans "Invalid credentials" %}
        <button type="button" class="close" data-dismiss="alert">&times;</button>
    </div>
    {% endif %}

    {% if _GET.iperr is defined %}
    <div class="alert alert-warning text-center alert-dismissible fade show" role="alert">
        {% trans "Access denied: unknown IP or device" %}
        <button type="button" class="close" data-dismiss="alert">&times;</button>
    </div>
    {% endif %}