Fix ticket exporter

src/pretix/plugins/ticketoutputpdf/exporters.py

@@ -1,8 +1,11 @@
 from io import BytesIO
 
+from django.core.files.base import ContentFile
 from django.utils.translation import ugettext as _
+from PyPDF2.merger import PdfFileMerger
 
 from pretix.base.exporter import BaseExporter
+from pretix.base.i18n import language
 from pretix.base.models import Order, OrderPosition
 
 from .ticketoutput import PdfTicketOutput
@@ -14,20 +17,30 @@ class AllTicketsPDF(BaseExporter):
     identifier = "pdfoutput_all_tickets"
 
     def render(self, form_data):
+        merger = PdfFileMerger()
+
         o = PdfTicketOutput(self.event)
         qs = OrderPosition.objects.filter(order__event=self.event, order__status=Order.STATUS_PAID).select_related(
             'order', 'item', 'variation'
         )
-        buffer = BytesIO()
-        p = o._create_canvas(buffer)
+
         for op in qs:
             if op.addon_to_id and not self.event.settings.ticket_download_addons:
                 continue
             if not op.item.admission and not self.event.settings.ticket_download_nonadm:
                 continue
-            layout = o.layout_map.get(op.item_id, o.default_layout)
-            o._draw_page(layout, p, op, op.order)
 
-        p.save()
-        outbuffer = o._render_with_background(buffer)
+            with language(op.order.locale):
+                buffer = BytesIO()
+                p = o._create_canvas(buffer)
+                layout = o.layout_map.get(op.item_id, o.default_layout)
+                o._draw_page(layout, p, op, op.order)
+                p.save()
+                outbuffer = o._render_with_background(layout, buffer)
+                merger.append(ContentFile(outbuffer.read()))
+
+        outbuffer = BytesIO()
+        merger.write(outbuffer)
+        merger.close()
+        outbuffer.seek(0)
         return '{}_tickets.pdf'.format(self.event.slug), 'application/pdf', outbuffer.read()