Fix untranslated titles of export providers

src/pretix/base/exporters/invoices.py

@@ -3,7 +3,7 @@ import tempfile
 from zipfile import ZipFile
 
 from django.dispatch import receiver
-from django.utils.translation import ugettext as _
+from django.utils.translation import ugettext_lazy as _
 
 from ..exporter import BaseExporter
 from ..services.invoices import invoice_pdf_task

src/pretix/base/exporters/mail.py

@@ -2,7 +2,7 @@ from collections import OrderedDict
 
 from django import forms
 from django.dispatch import receiver
-from django.utils.translation import ugettext as _
+from django.utils.translation import ugettext_lazy as _
 
 from ..exporter import BaseExporter
 from ..models import Order

src/pretix/base/exporters/orderlist.py

@@ -8,7 +8,7 @@ from django import forms
 from django.db.models import Sum
 from django.dispatch import receiver
 from django.utils.formats import localize
-from django.utils.translation import ugettext as _
+from django.utils.translation import ugettext as _, ugettext_lazy
 
 from pretix.base.models import InvoiceAddress, Order, OrderPosition
 
@@ -18,7 +18,7 @@ from ..signals import register_data_exporters, register_payment_providers
 
 class OrderListExporter(BaseExporter):
     identifier = 'orderlistcsv'
-    verbose_name = _('List of orders (CSV)')
+    verbose_name = ugettext_lazy('List of orders (CSV)')
 
     @property
     def export_form_fields(self):

src/pretix/plugins/checkinlists/exporters.py

@@ -3,7 +3,7 @@ import io
 from collections import OrderedDict
 
 from django import forms
-from django.utils.translation import ugettext as _
+from django.utils.translation import ugettext as _, ugettext_lazy
 
 from pretix.base.exporter import BaseExporter
 from pretix.base.models import Order, OrderPosition, Question
@@ -16,7 +16,7 @@ class BaseCheckinList(BaseExporter):
 class CSVCheckinList(BaseCheckinList):
     name = "overview"
     identifier = 'checkinlistcsv'
-    verbose_name = _('Check-in list (CSV)')
+    verbose_name = ugettext_lazy('Check-in list (CSV)')
 
     @property
     def export_form_fields(self):