Only add Uyghur to supported languages under Django 5.x

wagtail/admin/localization.py

@@ -1,6 +1,7 @@
 import functools
 
 import zoneinfo
+from django import VERSION as DJANGO_VERSION
 from django.conf import settings
 from django.utils.dates import MONTHS, WEEKDAYS, WEEKDAYS_ABBR
 from django.utils.translation import gettext as _
@@ -41,12 +42,15 @@ WAGTAILADMIN_PROVIDED_LANGUAGES = [
     ("sl", "Slovenian"),
     ("th", "Thai"),
     ("tr", "Turkish"),
-    ("ug", "Uyghur"),
     ("uk", "Ukrainian"),
     ("zh-hans", "Chinese (Simplified)"),
     ("zh-hant", "Chinese (Traditional)"),
 ]
 
+if DJANGO_VERSION >= (5, 0):
+    WAGTAILADMIN_PROVIDED_LANGUAGES.append(("ug", "Uyghur"))
+    WAGTAILADMIN_PROVIDED_LANGUAGES.sort()
+
 
 # Translatable strings to be made available to JavaScript code
 # as the wagtailConfig.STRINGS object