add order-level questions to order modify form

src/pretix/control/templates/pretixcontrol/items/questions.html

@@ -20,7 +20,7 @@
     {% endif %}
 
     <h2>{% trans "Per-ticket questions" %}</h2>
-    <p>{% trans "These questions are asked for every ticket, so possible multiple times in the same order." %}</p>
+    <p>{% trans "These questions are asked for every ticket, so possibly multiple times in the same order." %}</p>
     <div class="table-responsive">
         <table class="table table-hover table-quotas">
             <thead>

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

@@ -48,6 +48,18 @@
                     </div>
                 </details>
             {% endif %}
+            {% if order_questions_form %}
+                <details class="panel panel-default" open id="invoice-details">
+                    <summary class="panel-heading">
+                        <h3 class="panel-title">
+                            <strong>{% trans "Additional order information" %}</strong>
+                        </h3>
+                    </summary>
+                    <div class="panel-body">
+                        {% bootstrap_form order_questions_form layout="checkout" %}
+                    </div>
+                </details>
+            {% endif %}
             {% for pos, forms in formgroups %}
                 <details class="panel panel-default" open>
                     <summary class="panel-heading">