修改翻译_map类型为Map<String, String>

lib/process/language/measure_language.dart

@@ -1,14 +1,13 @@
 import 'dart:convert';
 
 class MeasureLanguage {
-  static var _map = {};
+  static Map<String, String> _map = {};
 
   static void load(String mapJson) {
     _map = jsonDecode(mapJson)["Language"];
   }
 
   static String t(String code) {
-    return "Test";
     if (_map.containsKey(code)) {
       return _map[code]!;
     } else {