Display errors caused in AJAX requests

src/pretix/base/templates/400.html

@@ -6,7 +6,7 @@
     <h1>{% trans "Bad Request" %}</h1>
     <p>{% trans "We were unable to parse your request." %}</p>
     <p>{{ exception }}</p>
-    <p>
+    <p class="links">
         <a href="javascript:history.back()">{% trans "Take a step back" %}</a>
         &middot; <a href="javascript:location.reload()">{% trans "Try again" %}</a>
     </p>

src/pretix/base/templates/403.html

@@ -6,7 +6,7 @@
     <h1>{% trans "Permission denied" %}</h1>
     <p>{% trans "You do not have access to this page." %}</p>
     <p>{{ exception }}</p>
-    <p>
+    <p class="links">
         <a href="javascript:history.back()">{% trans "Take a step back" %}</a>
         &middot; <a href="javascript:location.reload()">{% trans "Try again" %}</a>
     </p>

src/pretix/base/templates/404.html

@@ -6,7 +6,7 @@
     <h1>{% trans "Not found" %}</h1>
     <p>{% trans "I'm afraid we could not find the the resource you requested." %}</p>
     <p>{{ exception }}</p>
-    <p>
+    <p class="links">
         <a href="javascript:history.back()">{% trans "Take a step back" %}</a>
     </p>
 {% endblock %}

src/pretix/base/templates/500.html

@@ -7,7 +7,7 @@
     <p>{% trans "We had trouble processing your request." %}</p>
     <p>{% trans "If this problem persists, please contact us." %}</p>
     <p>{{ exception }}</p>
-    <p>
+    <p class="links">
         <a href="javascript:history.back()">{% trans "Take a step back" %}</a>
         &middot; <a href="javascript:location.reload()">{% trans "Try again" %}</a>
     </p>

src/pretix/base/templates/csrffail.html

@@ -18,7 +18,7 @@
             Please go back to the last page, refresh this page and then try again. If the problem persists, please get in touch with us.
         {% endblocktrans %}</p>
     {% endif %}
-    <p>
+    <p class="links">
         <a href="javascript:history.back()">{% trans "Take a step back" %}</a>
     </p>
 {% endblock %}

src/pretix/presale/templates/pretixpresale/base.html

@@ -37,6 +37,8 @@
         {% endblocktrans %}
     {% endwith %}
 </footer>
+<div id="ajaxerr">
+</div>
 <div id="loadingmodal">
     <i class="fa fa-cog big-rotating-icon"></i>
     <h1>{% trans "We are processing your request…" %}</h1>