          return queryset.filter(**filter_kwargs)
  
  
  class UniqueForYearValidator(BaseUniqueForValidator):
      message = _('This field must be unique for the "{date_field}" year.')
  
      def filter_queryset(self, attrs, queryset):
          value = attrs[self.field]
          date = attrs[self.date_field]
  
 
</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.") </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     message = _('This field must be unique.')
 </s> add     message = _("This field must be unique.") </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     missing_message = _('This field is required.')
 </s> add     missing_message = _("This field is required.")
    message = _("This field must be unique for the \"{date_field}\" year.")
          return queryset.filter(**filter_kwargs)
  
  
  class UniqueForYearValidator(BaseUniqueForValidator):
    message = _("This field must be unique for the \"{date_field}\" year.")
  
      def filter_queryset(self, attrs, queryset):
          value = attrs[self.field]
          date = attrs[self.date_field]
  
keep keep keep keep replace keep keep keep keep keep
 use double quotes for user visible strings; end user visible strings in full stops; add some missing translation tags 
rest_framework/validators.py