Use custom error layout for shop offline

src/pretix/presale/templates/pretixpresale/event/offline.html

@@ -0,0 +1,28 @@
+{% extends "error.html" %}
+{% load i18n %}
+{% load static %}
+{% block title %}{% trans "Shop offline" %}{% endblock %}
+{% block content %}
+    <i class="fa fa-fw fa-power-off big-icon"></i>
+    <div class="error-details">
+        <h1>{% trans "Shop offline" %}</h1>
+        <p>{% trans "This ticket shop is currently turned off." %}</p>
+        <p>{% trans "It is only accessible to authenticated team members." %}</p>
+        <p>{% trans "Please try again later." %}</p>
+        <p class="links">
+            <a id='goback' href='#'>{% trans "Take a step back" %}</a>
+            &middot; <a id='reload' href='#'>{% trans "Try again" %}</a>
+        </p>
+        {% if request.user.is_staff and not staff_session %}
+            <form action="{% url 'control:user.sudo' %}?next={{ request.path|add:"?"|add:request.GET.urlencode|urlencode }}" method="post">
+                <p>
+                    {% csrf_token %}
+                    <button type="submit" class="btn btn-default" id="button-sudo">
+                        <i class="fa fa-id-card"></i> {% trans "Admin mode" %}
+                    </button>
+                </p>
+            </form>
+        {% endif %}
+        <img src="{% static "pretixbase/img/pretix-logo.svg" %}" class="logo"/>
+    </div>
+{% endblock %}