Small refinements on the previous commit

src/pretix/base/forms/__init__.py

@@ -6,9 +6,10 @@ from django.utils import six
 from django.utils.crypto import get_random_string
 from hierarkey.forms import HierarkeyForm
 
-from .validators import PlaceholderValidator
 from pretix.base.models import Event
 
+from .validators import PlaceholderValidator  # NOQA
+
 logger = logging.getLogger('pretix.plugins.ticketoutputpdf')
 
 

src/pretix/base/forms/validators.py

@@ -1,7 +1,9 @@
 import re
+
 from django.core.exceptions import ValidationError
 from django.core.validators import BaseValidator
 from django.utils.translation import ugettext_lazy as _
+from i18nfield.strings import LazyI18nString
 
 
 class PlaceholderValidator(BaseValidator):
@@ -16,6 +18,11 @@ class PlaceholderValidator(BaseValidator):
         self.limit_value = limit_value
 
     def __call__(self, value):
+        if isinstance(value, LazyI18nString):
+            for l, v in value.data.items():
+                self.__call__(v)
+            return
+
         data_placeholders = list(re.findall(r'({[\w\s]*})', value, re.X))
         invalid_placeholders = []
         for placeholder in data_placeholders: