Fixed #35870 -- Made blank choice label in forms more accessible.

Added new constant django.db.models.fields.BLANK_CHOICE_LABEL for
an accessible and translatable blank choice label in forms.
Deprecated django.db.models.fields.BLANK_CHOICE_DASH constant.
Added the immediately deprecated transitional setting
USE_BLANK_CHOICE_DASH.

Co-Authored-By: Marijke Luttekes <mail@marijkeluttekes.dev>

1 files changed, 4 insertions, 1 deletions

diff --git a/django/contrib/admin/options.py b/django/contrib/admin/options.py
index bb091e4c52..71d4a2d55c 100644
--- a/django/contrib/admin/options.py
+++ b/django/contrib/admin/options.py
@@ -43,6 +43,7 @@ from django.core.exceptions import (
 from django.core.paginator import Paginator
 from django.db import models, router, transaction
 from django.db.models.constants import LOOKUP_SEP
+from django.db.models.utils import get_blank_choice_label
 from django.forms.formsets import DELETION_FIELD_NAME, all_valid
 from django.forms.models import (
     BaseInlineFormSet,
@@ -1049,11 +1050,13 @@ class ModelAdmin(BaseModelAdmin):
         actions = self._filter_actions_by_permissions(request, self._get_base_actions())
         return {name: (func, name, desc) for func, name, desc in actions}
 
-    def get_action_choices(self, request, default_choices=models.BLANK_CHOICE_DASH):
+    def get_action_choices(self, request, default_choices=None):
         """
         Return a list of choices for use in a form object. Each choice is a
         tuple (name, description).
         """
+        if default_choices is None:
+            default_choices = [("", get_blank_choice_label())]
         choices = [*default_choices]
         for func, name, description in self.get_actions(request).values():
             choice = (name, description % model_format_dict(self.opts))