Clean up normalizeLocale for mono browser target (#112575)

Author: IDisposable

src/mono/browser/runtime/globalization-locale.ts

@@ -12,13 +12,13 @@ function normalizeLocale (locale: string | null) {
     if (!locale)
         return undefined;
     try {
-        locale = locale.toLocaleLowerCase();
-        if (locale.includes("zh")) {
-            // browser does not recognize "zh-chs" and "zh-cht" as equivalents of "zh-HANS" "zh-HANT", we are helping, otherwise
+        locale = locale.toLocaleLowerCase().replace("_", "-");
+        if (locale.startsWith("zh-")) {
+            // browser does not recognize "zh-chs" and "zh-cht" as equivalents of "zh-Hans" "zh-Hant", we are helping, otherwise
             // it would throw on getCanonicalLocales with "RangeError: Incorrect locale information provided"
-            locale = locale.replace("chs", "HANS").replace("cht", "HANT");
+            locale = locale.replace("-chs", "-Hans").replace("-cht", "-Hant");
         }
-        const canonicalLocales = (Intl as any).getCanonicalLocales(locale.replace("_", "-"));
+        const canonicalLocales = (Intl as any).getCanonicalLocales(locale);
         return canonicalLocales.length > 0 ? canonicalLocales[0] : undefined;
     } catch {
         return undefined;