diff --git a/src/pretix/presale/views/cart.py b/src/pretix/presale/views/cart.py
index e2e529cafb..d581f74c5e 100644
--- a/src/pretix/presale/views/cart.py
+++ b/src/pretix/presale/views/cart.py
@@ -35,6 +35,7 @@
 import json
 import mimetypes
 import os
+import urllib
 from decimal import Decimal
 from urllib.parse import quote
 
@@ -90,16 +91,22 @@ class CartActionMixin:
             if 'cart_namespace' in self.kwargs:
                 kwargs['cart_namespace'] = self.kwargs['cart_namespace']
             u = eventreverse(self.request.event, 'presale:event.index', kwargs=kwargs)
-        if '?' in u:
-            u += '&require_cookie=true'
-        else:
-            u += '?require_cookie=true'
+
+        query = {'require_cookie': 'true'}
+
+        if 'locale' in self.request.GET:
+            query['locale'] = self.request.GET['locale']
         disclose_cart_id = (
             'iframe' in self.request.GET or settings.SESSION_COOKIE_NAME not in self.request.COOKIES
         ) and self.kwargs.get('cart_namespace')
         if disclose_cart_id:
             cart_id = get_or_create_cart_id(self.request)
-            u += '&cart_id={}'.format(cart_id)
+            query['cart_id'] = cart_id
+
+        if '?' in u:
+            u += '&' + urllib.parse.urlencode(query)
+        else:
+            u += '?' + urllib.parse.urlencode(query)
         return u
 
     def get_success_url(self, value=None):
@@ -489,6 +496,8 @@ class CartAdd(EventViewMixin, CartActionMixin, AsyncAction, View):
         u = super().get_check_url(task_id, ajax)
         if "next" in self.request.GET:
             u += "&next=" + quote(self.request.GET.get('next'))
+        if "locale" in self.request.GET and "locale=" not in u:
+            u += "&locale=" + quote(self.request.GET.get('locale'))
         if "next_error" in self.request.GET:
             u += "&next_error=" + quote(self.request.GET.get('next_error'))
         if ajax:
diff --git a/src/pretix/presale/views/event.py b/src/pretix/presale/views/event.py
index a250a27aad..a1d90822f4 100644
--- a/src/pretix/presale/views/event.py
+++ b/src/pretix/presale/views/event.py
@@ -35,6 +35,7 @@
 import calendar
 import hashlib
 import sys
+import urllib.parse
 from collections import defaultdict
 from datetime import date, datetime, timedelta
 from decimal import Decimal
@@ -423,9 +424,11 @@ class EventIndex(EventViewMixin, EventListMixin, CartMixin, TemplateView):
         elif request.GET.get('iframe', '') == '1' and 'take_cart_id' in request.GET:
             # Widget just opened, a cart already exists. Let's to a stupid redirect to check if cookies are disabled
             get_or_create_cart_id(request)
-            return redirect(eventreverse(request.event, 'presale:event.index', kwargs=kwargs) + '?require_cookie=true&cart_id={}'.format(
-                request.GET.get('take_cart_id')
-            ))
+            return redirect(eventreverse(request.event, 'presale:event.index', kwargs=kwargs) + '?' + urllib.parse.urlencode({
+                'require_cookie': 'true',
+                'cart_id': request.GET.get('take_cart_id'),
+                **({"locale": request.GET.get('locale')} if request.GET.get('locale') else {}),
+            }))
         elif request.GET.get('iframe', '') == '1' and len(self.request.GET.get('widget_data', '{}')) > 3:
             # We've been passed data from a widget, we need to create a cart session to store it.
             get_or_create_cart_id(request)
@@ -434,10 +437,11 @@ class EventIndex(EventViewMixin, EventListMixin, CartMixin, TemplateView):
             r = render(request, 'pretixpresale/event/cookies.html', {
                 'url': eventreverse(
                     request.event, "presale:event.index", kwargs={'cart_namespace': kwargs.get('cart_namespace') or ''}
-                ) + (
-                    "?src=widget&take_cart_id={}".format(request.GET.get('cart_id'))
-                    if "cart_id" in request.GET else ""
-                )
+                ) + "?" + urllib.parse.urlencode({
+                    "src": "widget",
+                    **({"locale": request.GET.get('locale')} if request.GET.get('locale') else {}),
+                    **({"take_cart_id": request.GET.get('cart_id')} if request.GET.get('cart_id') else {}),
+                })
             })
             r._csp_ignore = True
             return r
diff --git a/src/pretix/presale/views/waiting.py b/src/pretix/presale/views/waiting.py
index 4644a7d37b..c39e56eede 100644
--- a/src/pretix/presale/views/waiting.py
+++ b/src/pretix/presale/views/waiting.py
@@ -80,7 +80,7 @@ class WaitingView(EventViewMixin, FormView):
             r = render(request, 'pretixpresale/event/cookies.html', {
                 'url': eventreverse(
                     request.event, "presale:event.waitinglist", kwargs={'cart_namespace': kwargs.get('cart_namespace')}
-                ) + '?' + url_replace(request, 'require_cookie', '', 'iframe', '')
+                ) + '?' + url_replace(request, 'require_cookie', '', 'iframe', '', 'locale', request.GET.get('locale', get_language_without_region()))
             })
             r._csp_ignore = True
             return r