Allow to set privacy policy URL per language (#3146)

src/pretix/base/forms/__init__.py

@@ -36,11 +36,13 @@ import logging
 
 import i18nfield.forms
 from django import forms
+from django.core.validators import URLValidator
 from django.forms.models import ModelFormMetaclass
 from django.utils.crypto import get_random_string
 from django.utils.translation import gettext_lazy as _
 from formtools.wizard.views import SessionWizardView
 from hierarkey.forms import HierarkeyForm
+from i18nfield.strings import LazyI18nString
 
 from pretix.base.reldate import RelativeDateField, RelativeDateTimeField
 
@@ -222,3 +224,17 @@ class SecretKeySettingsField(forms.CharField):
         if value == SECRET_REDACTED:
             return
         return super().run_validators(value)
+
+
+class I18nURLFormField(i18nfield.forms.I18nFormField):
+    def clean(self, value) -> LazyI18nString:
+        value = super().clean(value)
+        if not value:
+            return value
+        if isinstance(value.data, dict):
+            for v in value.data.values():
+                if v:
+                    URLValidator()(v)
+        else:
+            URLValidator()(value.data)
+        return value