[1.6.x] Fixed #20582 -- Allowed default Form.label_suffix to be translated

Thanks Tim Graham for the review.
Backport of 7557207983 from master.

django/conf/locale/en/LC_MESSAGES/django.po

@@ -4,7 +4,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Django\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2013-05-25 14:27+0200\n"
+"POT-Creation-Date: 2013-06-11 18:44+0200\n"
 "PO-Revision-Date: 2010-05-13 15:35+0200\n"
 "Last-Translator: Django team\n"
 "Language-Team: English <en@li.org>\n"
@@ -699,11 +699,22 @@ msgstr ""
 msgid "Enter a list of values."
 msgstr ""
 
-#: forms/forms.py:158
+#. Translators: This is the default suffix added to form field labels
+#: forms/forms.py:90
+msgid ":"
+msgstr ""
+
+#: forms/forms.py:159
 #, python-format
 msgid "(Hidden field %(name)s) %(error)s"
 msgstr ""
 
+#. Translators: If found as last label character, these punctuation
+#. characters will prevent the default label_suffix to be appended to the label
+#: forms/forms.py:525
+msgid ":?.!"
+msgstr ""
+
 #: forms/formsets.py:310
 #, python-format
 msgid "Please submit %d or fewer forms."

django/forms/forms.py

@@ -77,7 +77,7 @@ class BaseForm(object):
     # information. Any improvements to the form API should be made to *this*
     # class, not to the Form class.
     def __init__(self, data=None, files=None, auto_id='id_%s', prefix=None,
-                 initial=None, error_class=ErrorList, label_suffix=':',
+                 initial=None, error_class=ErrorList, label_suffix=None,
                  empty_permitted=False):
         self.is_bound = data is not None or files is not None
         self.data = data or {}
@@ -86,7 +86,8 @@ class BaseForm(object):
         self.prefix = prefix
         self.initial = initial or {}
         self.error_class = error_class
-        self.label_suffix = label_suffix
+        # Translators: This is the default suffix added to form field labels
+        self.label_suffix = label_suffix if label_suffix is not None else _(':')
         self.empty_permitted = empty_permitted
         self._errors = None # Stores the errors after clean() has been called.
         self._changed_data = None
@@ -518,7 +519,9 @@ class BoundField(object):
         """
         contents = contents or self.label
         # Only add the suffix if the label does not end in punctuation.
-        if self.form.label_suffix and contents and contents[-1] not in ':?.!':
+        # Translators: If found as last label character, these punctuation
+        # characters will prevent the default label_suffix to be appended to the label
+        if self.form.label_suffix and contents and contents[-1] not in _(':?.!'):
             contents = format_html('{0}{1}', contents, self.form.label_suffix)
         widget = self.field.widget
         id_ = widget.attrs.get('id') or self.auto_id

django/forms/models.py

@@ -292,7 +292,7 @@ class ModelFormMetaclass(type):
 
 class BaseModelForm(BaseForm):
     def __init__(self, data=None, files=None, auto_id='id_%s', prefix=None,
-                 initial=None, error_class=ErrorList, label_suffix=':',
+                 initial=None, error_class=ErrorList, label_suffix=None,
                  empty_permitted=False, instance=None):
         opts = self._meta
         if opts.model is None:

docs/ref/forms/api.txt

@@ -500,9 +500,15 @@ By default, ``auto_id`` is set to the string ``'id_%s'``.
 
 .. attribute:: Form.label_suffix
 
-Normally, a colon (``:``) will be appended after any label name when a form is
-rendered. It's possible to change the colon to another character, or omit it
-entirely, using the ``label_suffix`` parameter::
+A translatable string (defaults to a colon (``:``) in English) that will be
+appended after any label name when a form is rendered.
+
+.. versionchanged:: 1.6
+
+    The default ``label_suffix`` is translatable.
+
+It's possible to customize that character, or omit it entirely, using the
+ ``label_suffix`` parameter::
 
     >>> f = ContactForm(auto_id='id_for_%s', label_suffix='')
     >>> print(f.as_ul())
@@ -518,7 +524,8 @@ entirely, using the ``label_suffix`` parameter::
     <li><label for="id_for_cc_myself">Cc myself -></label> <input type="checkbox" name="cc_myself" id="id_for_cc_myself" /></li>
 
 Note that the label suffix is added only if the last character of the
-label isn't a punctuation character (``.``, ``!``, ``?`` or ``:``)
+label isn't a punctuation character (in English, those are ``.``, ``!``, ``?``
+or ``:``).
 
 Notes on field ordering
 ~~~~~~~~~~~~~~~~~~~~~~~