From 9cfa792ba5189aa3b3a6d94a150ae290a61931ec Mon Sep 17 00:00:00 2001
From: Baoyuantop <baoyuan@api7.ai>
Date: Tue, 14 Apr 2026 13:16:04 +0800
Subject: [PATCH] fix(header): fix crash on language switch by adding missing
 'tr' lang and guard

Root cause: vite.config.ts i18nProgress plugin was configured with
langs: ['en', 'es', 'de', 'zh'] but LangMap defines 5 languages including
'tr' (Turkish). Accessing i18nProgress['tr'] returned undefined, causing
TypeError when reading .percent.

Fix:
1. Add 'tr' to langs array in vite.config.ts (root cause fix)
2. Add optional chaining in LanguageMenu.tsx (defensive guard)

Fixes #3300

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 src/components/Header/LanguageMenu.tsx | 2 +-
 vite.config.ts                         | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/components/Header/LanguageMenu.tsx b/src/components/Header/LanguageMenu.tsx
index 48fcd8f0ef..316daf05ec 100644
--- a/src/components/Header/LanguageMenu.tsx
+++ b/src/components/Header/LanguageMenu.tsx
@@ -30,7 +30,7 @@ const LangMap: Record<keyof Resources, string> = {
 };
 
 const TranslationProgress = ({ lang }: { lang: string }) => {
-  const percent = i18nProgress[lang].percent;
+  const percent = i18nProgress[lang as keyof typeof i18nProgress]?.percent;
   if (typeof percent === 'number' && percent < 100) {
     return (
       <span
diff --git a/vite.config.ts b/vite.config.ts
index 799fdf323d..09887546c7 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -91,7 +91,7 @@ export default defineConfig({
       semicolons: false,
     }),
     i18nProgress({
-      langs: ['en', 'es', 'de', 'zh'],
+      langs: ['en', 'es', 'de', 'zh', 'tr'],
       baseLang: 'en',
       getTranslationDir: (lang) => `./src/locales/${lang}`,
     }),