Fixed #18149 -- Changed language codes for Chinese

Language codes for Chinese are zh_Hans (Simplified) and zh_Hant (Traditional).
Added support for browsers that still send the deprecated language codes.

Thanks to Olli Wang for the report.

django/conf/global_settings.py

@@ -127,6 +127,8 @@ LANGUAGES = (
     ('ur', gettext_noop('Urdu')),
     ('vi', gettext_noop('Vietnamese')),
     ('zh-cn', gettext_noop('Simplified Chinese')),
+    ('zh-hans', gettext_noop('Simplified Chinese')),
+    ('zh-hant', gettext_noop('Traditional Chinese')),
     ('zh-tw', gettext_noop('Traditional Chinese')),
 )
 

django/conf/locale/__init__.py

@@ -485,6 +485,18 @@ LANG_INFO = {
         'name': 'Simplified Chinese',
         'name_local': '简体中文',
     },
+    'zh-hans': {
+        'bidi': False,
+        'code': 'zh-hans',
+        'name': 'Simplified Chinese',
+        'name_local': '简体中文',
+    },
+    'zh-hant': {
+        'bidi': False,
+        'code': 'zh-hant',
+        'name': 'Traditional Chinese',
+        'name_local': '繁體中文',
+    },
     'zh-tw': {
         'bidi': False,
         'code': 'zh-tw',

django/conf/locale/zh_CN/LC_MESSAGES/django.po

@@ -1,5 +1,8 @@
 # This file is distributed under the same license as the Django package.
 #
+# This is the *old* Simplified Chinese translation of Django
+# For future updates please use the translation in the "zh_Hans" directory.
+#
 # Translators:
 # Jannis Leidel <jannis@leidel.info>, 2011.
 # Kevin Shi <leiarix@gmail.com>, 2012.

django/conf/locale/zh_Hans/formats.py

@@ -0,0 +1,24 @@
+# -*- encoding: utf-8 -*-
+# This file is distributed under the same license as the Django package.
+#
+from __future__ import unicode_literals
+
+# The *_FORMAT strings use the Django date format syntax,
+# see http://docs.djangoproject.com/en/dev/ref/templates/builtins/#date
+# DATE_FORMAT =
+# TIME_FORMAT =
+# DATETIME_FORMAT =
+# YEAR_MONTH_FORMAT =
+# MONTH_DAY_FORMAT =
+# SHORT_DATE_FORMAT =
+# SHORT_DATETIME_FORMAT =
+# FIRST_DAY_OF_WEEK =
+
+# The *_INPUT_FORMATS strings use the Python strftime format syntax,
+# see http://docs.python.org/library/datetime.html#strftime-strptime-behavior
+# DATE_INPUT_FORMATS =
+# TIME_INPUT_FORMATS =
+# DATETIME_INPUT_FORMATS =
+# DECIMAL_SEPARATOR =
+# THOUSAND_SEPARATOR =
+# NUMBER_GROUPING =

django/conf/locale/zh_Hant/formats.py

@@ -0,0 +1,24 @@
+# -*- encoding: utf-8 -*-
+# This file is distributed under the same license as the Django package.
+#
+from __future__ import unicode_literals
+
+# The *_FORMAT strings use the Django date format syntax,
+# see http://docs.djangoproject.com/en/dev/ref/templates/builtins/#date
+# DATE_FORMAT =
+# TIME_FORMAT =
+# DATETIME_FORMAT =
+# YEAR_MONTH_FORMAT =
+# MONTH_DAY_FORMAT =
+# SHORT_DATE_FORMAT =
+# SHORT_DATETIME_FORMAT =
+# FIRST_DAY_OF_WEEK =
+
+# The *_INPUT_FORMATS strings use the Python strftime format syntax,
+# see http://docs.python.org/library/datetime.html#strftime-strptime-behavior
+# DATE_INPUT_FORMATS =
+# TIME_INPUT_FORMATS =
+# DATETIME_INPUT_FORMATS =
+# DECIMAL_SEPARATOR =
+# THOUSAND_SEPARATOR =
+# NUMBER_GROUPING =

django/conf/locale/zh_TW/LC_MESSAGES/django.po

@@ -1,5 +1,8 @@
 # This file is distributed under the same license as the Django package.
 #
+# This is the *old* Traditional Chinese translation of Django
+# For future updates please use the translation in the "zh_Hant" directory.
+#
 # Translators:
 #   <ilay@ilay.tw>, 2012.
 # Jannis Leidel <jannis@leidel.info>, 2011.

django/utils/translation/trans_real.py

@@ -202,6 +202,17 @@ def activate(language):
     language and installs it as the current translation object for the current
     thread.
     """
+    if isinstance(language, basestring):
+        if language == 'zh-cn':
+            warnings.warn(
+                "The use of the language code 'zh-cn' is deprecated. "
+                "Please use the 'zh-hans' translation instead.",
+                PendingDeprecationWarning, stacklevel=2)
+        elif language == 'zh-tw':
+            warnings.warn(
+                "The use of the language code 'zh-tw' is deprecated. "
+                "Please use the 'zh-hant' translation instead.",
+                PendingDeprecationWarning, stacklevel=2)
     _active.value = translation(language)
 
 
@@ -399,6 +410,12 @@ def get_supported_language_variant(lang_code, supported=None, strict=False):
     If `strict` is False (the default), the function will look for an alternative
     country-specific variant when the currently checked is not found.
     """
+    # some browsers use deprecated language codes -- #18419
+    if lang_code == 'zh-cn' and 'zh-hans' in supported:
+        return 'zh-hans'
+    elif lang_code == 'zh-tw' and 'zh-hant' in supported:
+        return 'zh-hant'
+
     if supported is None:
         from django.conf import settings
         supported = OrderedDict(settings.LANGUAGES)