fix: get correct lang

Signed-off-by: xjasonlyu <xjasonlyu@gmail.com>

internal/server/meta_init.go

@@ -311,7 +311,7 @@ func getLanguage(r *http.Request) string {
 	if 0 == len(language) {
 		language = "en_US"
 	} else {
-		strings.ReplaceAll(language, "-", "_")
+		language = strings.ReplaceAll(language, "-", "_")
 	}
 	return language
 }