diff --git a/src/client/app/boot.js b/src/client/app/boot.js
index 13abc86ad..70705e814 100644
--- a/src/client/app/boot.js
+++ b/src/client/app/boot.js
@@ -31,10 +31,11 @@
 
 	// Detect the user language
 	// Note: The default language is Japanese
-	let lang = navigator.language.split('-')[0];
-	if (!/^(en|ja)$/.test(lang)) lang = 'ja';
-	if (localStorage.getItem('lang')) lang = localStorage.getItem('lang');
-	if (ENV != 'production') lang = 'ja';
+	//let lang = navigator.language.split('-')[0];
+	//if (!/^(en|ja)$/.test(lang)) lang = 'ja';
+	//if (localStorage.getItem('lang')) lang = localStorage.getItem('lang');
+	//if (ENV != 'production') lang = 'ja';
+	const lang = 'ja';
 
 	// Detect the user agent
 	const ua = navigator.userAgent.toLowerCase();