Small refinements on the previous commit

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: