Presale: Add a language switch to the UI

src/pretix/presale/views/locale.py

@@ -0,0 +1,22 @@
+from datetime import datetime, timedelta
+from django.conf import settings
+from django.shortcuts import redirect
+from django.views.generic import View
+
+
+class LocaleSet(View):
+
+    def get(self, request, *args, **kwargs):
+        locale = request.GET.get('locale')
+        resp = redirect(request.GET.get('next', request.META.get('HTTP_REFERER', '/')))
+        if locale in [lc for lc, ll in settings.LANGUAGES]:
+            if request.user.is_authenticated():
+                request.user.locale = locale
+                request.user.save()
+
+            max_age = 10 * 365 * 24 * 60 * 60
+            resp.set_cookie(settings.LANGUAGE_COOKIE_NAME, locale, max_age=max_age,
+                            expires=(datetime.utcnow() + timedelta(seconds=max_age)).strftime(
+                                '%a, %d-%b-%Y %H:%M:%S GMT'),
+                            domain=settings.SESSION_COOKIE_DOMAIN)
+        return resp