Fix lang detection for zh-TW (#7326)

It is ``TW``, not ``tw``

src/lang.rs

@@ -92,7 +92,7 @@ pub fn translate_locale(name: String, locale: &str) -> String {
     if lang.is_empty() {
         // zh_CN on Linux, zh-Hans-CN on mac, zh_CN_#Hans on Android
         if locale.starts_with("zh") {
-            lang = (if locale.contains("tw") {
+            lang = (if locale.contains("TW") {
                 "zh-tw"
             } else {
                 "zh-cn"