Fixed #16501 -- Added an allow_unicode parameter to SlugField.

Thanks Flavio Curella and Berker Peksag for the initial patch.

docs/ref/forms/fields.txt

@@ -875,6 +875,15 @@ For each field, we describe the default widget used if you don't specify
    This field is intended for use in representing a model
    :class:`~django.db.models.SlugField` in forms.
 
+   Takes an optional parameter:
+
+   .. attribute:: allow_unicode
+
+       .. versionadded:: 1.9
+
+       A boolean instructing the field to accept Unicode letters in addition
+       to ASCII letters. Defaults to ``False``.
+
 ``TimeField``
 ~~~~~~~~~~~~~
 

docs/ref/models/fields.txt

@@ -1012,6 +1012,13 @@ It is often useful to automatically prepopulate a SlugField based on the value
 of some other value.  You can do this automatically in the admin using
 :attr:`~django.contrib.admin.ModelAdmin.prepopulated_fields`.
 
+.. attribute:: SlugField.allow_unicode
+
+    .. versionadded:: 1.9
+
+    If ``True``, the field accepts Unicode letters in addition to ASCII
+    letters. Defaults to ``False``.
+
 ``SmallIntegerField``
 ---------------------
 

docs/ref/utils.txt

@@ -836,11 +836,11 @@ appropriate entities.
 .. module:: django.utils.text
     :synopsis: Text manipulation.
 
-.. function:: slugify
+.. function:: slugify(allow_unicode=False)
 
-    Converts to ASCII. Converts spaces to hyphens. Removes characters that
-    aren't alphanumerics, underscores, or hyphens. Converts to lowercase. Also
-    strips leading and trailing whitespace.
+    Converts to ASCII if ``allow_unicode`` is ``False`` (default). Converts spaces to
+    hyphens. Removes characters that aren't alphanumerics, underscores, or
+    hyphens. Converts to lowercase. Also strips leading and trailing whitespace.
 
     For example::
 
@@ -849,6 +849,17 @@ appropriate entities.
     If ``value`` is ``"Joel is a slug"``, the output will be
     ``"joel-is-a-slug"``.
 
+    You can set the ``allow_unicode`` parameter to ``True``, if you want to
+    allow Unicode characters::
+
+        slugify(value, allow_unicode=True)
+
+    If ``value`` is ``"你好 World"``, the output will be ``"你好-world"``.
+
+    .. versionchanged:: 1.9
+
+        The ``allow_unicode`` parameter was added.
+
 .. _time-zone-selection-functions:
 
 ``django.utils.timezone``

docs/ref/validators.txt

@@ -183,6 +183,16 @@ to, or in lieu of custom ``field.clean()`` methods.
     A :class:`RegexValidator` instance that ensures a value consists of only
     letters, numbers, underscores or hyphens.
 
+``validate_unicode_slug``
+-------------------------
+
+.. data:: validate_unicode_slug
+
+    .. versionadded:: 1.9
+
+    A :class:`RegexValidator` instance that ensures a value consists of only
+    Unicode letters, numbers, underscores, or hyphens.
+
 ``validate_ipv4_address``
 -------------------------