add help text

src/pretix/control/templates/pretixcontrol/datasync/failed_jobs.html

@@ -3,6 +3,12 @@
 
 {% block content %}
     <h2>{% trans "Sync problems" %}</h2>
+    <p>
+        {% blocktrans trimmed %}
+            On this page, we provide a list of orders where data synchronisation to an external system has failed.
+            You can start another attempt to sync them manually.
+        {% endblocktrans %}
+    </p>
     <form method="post">
         {% csrf_token %}
         <table class="table table-hover">