  
  
  class BaseUniqueForValidator:
      message = None
      missing_message = _("This field is required.")
  
      def __init__(self, queryset, field, date_field, message=None):
          self.queryset = queryset
          self.field = field
          self.date_field = date_field
 
</s> remove     message = _("The fields {field_names} must make a unique set.")
    missing_message = _("This field is required.")
 </s> add     message = _('The fields {field_names} must make a unique set.')
    missing_message = _('This field is required.') </s> remove     message = _("This field must be unique.")
 </s> add     message = _('This field must be unique.') </s> remove     message = _("This field must be unique for the \"{date_field}\" date.")
 </s> add     message = _('This field must be unique for the "{date_field}" date.') </s> remove         'required': _("This field is required."),
        'null': _("This field may not be null.")
 </s> add         'required': _('This field is required.'),
        'null': _('This field may not be null.') </s> remove     message = _("This field must be unique for the \"{date_field}\" month.")
 </s> add     message = _('This field must be unique for the "{date_field}" month.')
    missing_message = _('This field is required.')
  
  
  class BaseUniqueForValidator:
      message = None
    missing_message = _('This field is required.')
  
      def __init__(self, queryset, field, date_field, message=None):
          self.queryset = queryset
          self.field = field
          self.date_field = date_field
keep keep keep keep replace keep keep keep keep keep
 prefer single quotes in source and double quotes in user visible strings; add some missing full stops to user visible strings 
rest_framework/validators.py