[WIP] Add i18n

Wox.UI.Flutter/wox/lib/api/wox_api.dart

@@ -1,7 +1,9 @@
+import 'dart:convert';
 import 'dart:core';
 
 import 'package:wox/entity/wox_ai.dart';
 import 'package:wox/entity/wox_image.dart';
+import 'package:wox/entity/wox_lang.dart';
 import 'package:wox/entity/wox_plugin.dart';
 import 'package:wox/entity/wox_query.dart';
 import 'package:wox/entity/wox_setting.dart';
@@ -99,6 +101,20 @@ class WoxApi {
     });
   }
 
+  Future<List<WoxLang>> getAllLanguages() async {
+    return await WoxHttpUtil.instance.postData("/lang/available", {});
+  }
+
+  Future<Map<String, String>> getLangJson(String langCode) async {
+    var langJsonStr = await WoxHttpUtil.instance.postData("/lang/json", {
+      "langCode": langCode,
+    });
+
+    //unmarshal json string to map
+    var jsonMap = json.decode(langJsonStr);
+    return jsonMap.cast<String, String>();
+  }
+
   Future<void> onProtocolUrlReceived(String command, Map<String, String> arguments) async {
     await WoxHttpUtil.instance.postData("/deeplink", {
       "command": command,

Wox.UI.Flutter/wox/lib/entity/wox_lang.dart

@@ -0,0 +1,20 @@
+class WoxLang {
+  final String code;
+  final String name;
+
+  WoxLang({required this.code, required this.name});
+
+  factory WoxLang.fromJson(Map<String, dynamic> json) {
+    return WoxLang(
+      code: json['Code'],
+      name: json['Name'],
+    );
+  }
+
+  Map<String, dynamic> toJson() {
+    final Map<String, dynamic> data = <String, dynamic>{};
+    data['Code'] = code;
+    data['Name'] = name;
+    return data;
+  }
+}

Wox.UI.Flutter/wox/lib/main.dart

@@ -56,7 +56,12 @@ Future<void> initialServices(List<String> arguments) async {
   await WoxWebsocketMsgUtil.instance.initialize(Uri.parse("ws://localhost:${Env.serverPort}/ws"), onMessageReceived: launcherController.handleWebSocketMessage);
   HeartbeatChecker().startChecking();
   Get.put(launcherController);
-  Get.put(WoxSettingController());
+  var woxSettingController = WoxSettingController();
+  Get.put(woxSettingController);
+
+  //load lang
+  var langCode = WoxSettingUtil.instance.currentSetting.langCode;
+  woxSettingController.updateLang(langCode);
 }
 
 Future<void> initDeepLink() async {