Open Stack

** Project changed: openstack-i18n => oslo.i18n

** Tags added: i18n

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https://bugs.launchpad.net/bugs/1665255

Title:
  request to OpenStack service with header "Accept-Language: zh-TW", but
  the response language is not

Status in oslo.i18n:
  New

Bug description:
  In my OpenStack Mitaka cluster, I want to make the service response with zh-TW language, according to the steps below.
  (take the glance service as example)

  
  1 stop glance-api service with "systemctl stop glance-api"
  2 export the env with "export GLANCE_LOCALEDIR=/usr/lib/python2.7/site-packages/glance/locale/ "
  3 start glance-api service with "systemctl start glance-api"
  4 show image detail with wrong uuid; 
  curl -g -i -X GET http://192.168.51.253:9292/v2/images/8b0e2af4-178e-48bdbad30fe6e99d1ca2 H "User-Agent: python-glanceclient" -H "Content-Type: application/octet-stream" -H "X-Auth-Token: $token" -H "Accept-Language: zh-TW"

  
  expect i18n translate the exception to zh-TW, but the response is zh-CN

  
  https://github.com/openstack/oslo.i18n/blob/master/oslo_i18n/_gettextutils.py#L84

  language_list.extend(alias for locale, alias in aliases.items()
                           if (locale in language_list and
                               alias not in language_list))

  the zh_Hant is not in the language_list, so the zh_TW will not append
  to the language_list

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