new_contents: from __future__ import with_statement
  
  from base import TestCase
  
  
  class TestValidateOnSubmit(TestCase):
      def test_submitted_and_valid(self):
          self.app.config['CSRF_ENABLED'] = False
  
          response = self.client.post(
              "/",
              headers={'Accept-Language': 'zh-CN,zh;q=0.8'},
              data={}
          )
          assert '\u8be5\u5b57\u6bb5\u662f' in response.data
  
subject: add test case for i18n