From ca759e024666987f80bd7f59d37eb130f2a8036f Mon Sep 17 00:00:00 2001
From: Huang Xin <chrox.huang@gmail.com>
Date: Wed, 10 Dec 2025 23:24:01 +0800
Subject: [PATCH] fix(tts): avoid false default en language code for TTS
 (#2678)

---
 apps/readest-app/src/services/transformers/language.ts | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/apps/readest-app/src/services/transformers/language.ts b/apps/readest-app/src/services/transformers/language.ts
index f3b578da..448acf45 100644
--- a/apps/readest-app/src/services/transformers/language.ts
+++ b/apps/readest-app/src/services/transformers/language.ts
@@ -17,7 +17,10 @@ export const languageTransformer: Transformer = {
       const docLang = langMatch?.[1] || xmlLangMatch?.[1];
       if (!isValidLang(docLang) || !isSameLang(docLang, primaryLanguage)) {
         const mainContent = result.replace(/<[^>]+>/g, ' ');
-        const lang = isValidLang(primaryLanguage) ? primaryLanguage : detectLanguage(mainContent);
+        const lang =
+          isValidLang(primaryLanguage) && primaryLanguage !== 'en'
+            ? primaryLanguage
+            : detectLanguage(mainContent);
         const newLangAttr = ` lang="${lang}"`;
         const newXmlLangAttr = ` xml:lang="${lang}"`;
         attrs = langMatch ? attrs.replace(langRegex, newLangAttr) : attrs + newLangAttr;