Fixes #30342 -- Removed a system check for LANGUAGES_BIDI setting.

This partly reverts commit 4400d829.

django/core/checks/translation.py

@@ -24,12 +24,6 @@ E004 = Error(
     id='translation.E004',
 )
 
-E005 = Error(
-    'You have provided values in the LANGUAGES_BIDI setting that are not in '
-    'the LANGUAGES setting.',
-    id='translation.E005',
-)
-
 
 @register(Tags.translation)
 def check_setting_language_code(app_configs, **kwargs):
@@ -62,9 +56,6 @@ def check_setting_languages_bidi(app_configs, **kwargs):
 def check_language_settings_consistent(app_configs, **kwargs):
     """Error if language settings are not consistent with each other."""
     available_tags = {i for i, _ in settings.LANGUAGES} | {'en-us'}
-    messages = []
     if settings.LANGUAGE_CODE not in available_tags:
-        messages.append(E004)
-    if not available_tags.issuperset(settings.LANGUAGES_BIDI):
-        messages.append(E005)
-    return messages
+        return [E004]
+    return []

docs/ref/checks.txt

@@ -448,9 +448,6 @@ The following checks are performed on your translation configuration:
 * **translation.E004**: You have provided a value for the
   :setting:`LANGUAGE_CODE` setting that is not in the :setting:`LANGUAGES`
   setting.
-* **translation.E005**: You have provided values in the
-  :setting:`LANGUAGES_BIDI` setting that are not in the :setting:`LANGUAGES`
-  setting.
 
 URLs
 ----

docs/ref/settings.txt

@@ -1879,15 +1879,17 @@ Here's a sample settings file::
 ``LANGUAGES_BIDI``
 ------------------
 
-Default: A list of all language codes from the :setting:`LANGUAGES` setting
-that are written right-to-left. You can see the current list of these languages
-by looking in :source:`django/conf/global_settings.py`.
+Default: A list of all language codes that are written right-to-left. You can
+see the current list of these languages by looking in
+:source:`django/conf/global_settings.py`.
 
 The list contains :term:`language codes<language code>` for languages that are
 written right-to-left.
 
 Generally, the default value should suffice. Only set this setting if you want
 to restrict language selection to a subset of the Django-provided languages.
+If you define a custom :setting:`LANGUAGES` setting, the list of bidirectional
+languages may contain language codes which are not enabled on a given site.
 
 .. setting:: LOCALE_PATHS
 

tests/check_framework/test_translation.py

@@ -80,15 +80,7 @@ class TranslationCheckTests(SimpleTestCase):
             'You have provided a value for the LANGUAGE_CODE setting that is '
             'not in the LANGUAGES setting.'
         )
-        with self.settings(LANGUAGE_CODE='fr', LANGUAGES=[('en', 'English')], LANGUAGES_BIDI=[]):
+        with self.settings(LANGUAGE_CODE='fr', LANGUAGES=[('en', 'English')]):
             self.assertEqual(check_language_settings_consistent(None), [
                 Error(msg, id='translation.E004'),
             ])
-        msg = (
-            'You have provided values in the LANGUAGES_BIDI setting that are '
-            'not in the LANGUAGES setting.'
-        )
-        with self.settings(LANGUAGE_CODE='en', LANGUAGES=[('en', 'English')], LANGUAGES_BIDI=['he']):
-            self.assertEqual(check_language_settings_consistent(None), [
-                Error(msg, id='translation.E005'),
-            ])