From 2fa3da361028123a10e708ada867f159802c15bf Mon Sep 17 00:00:00 2001
From: Winston Sung <winston21.sung@gmail.com>
Date: Fri, 1 Dec 2023 15:59:34 +0000
Subject: [PATCH] ULS: Fix JavaScript language fallback mapping being
 overridden

Follow-up of commit 728421587938a768de9259e68e498c53ff13d2b9
(Change-Id I9f68e0744bf0c730aa3a410901a9b536af7623fc)

Bug: T348376
Change-Id: Ic4331f635da2ee3de1211448838bc8cf145a808e
---
 resources/js/ext.uls.i18n.js | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/resources/js/ext.uls.i18n.js b/resources/js/ext.uls.i18n.js
index 4123fd64..ae7a7a7a 100644
--- a/resources/js/ext.uls.i18n.js
+++ b/resources/js/ext.uls.i18n.js
@@ -27,8 +27,16 @@
 		locale: mw.config.get( 'wgUserLanguage' )
 	} );
 
-	// ApiULSLocalization handles fallback in ULS
-	$.i18n.fallbacks = {};
+	/**
+	 * T53923: Fix JavaScript error with language fallbacks.
+	 * ULS use ApiULSLocalization to handle language fallbacks.
+	 *
+	 * T348376: Fix JavaScript language fallback mapping being
+	 * overridden.
+	 * This should not override the original mapping, as it's not
+	 * only used by ULS.
+	 */
+	$.i18n.fallbacks = $.i18n.fallbacks || {};
 
 	/**
 	 * Load localization messages for a locale to the jquery.i18n