feat: add translate

mainwindow.h

@@ -4,6 +4,7 @@
 #include <QMainWindow>
 #include <QDebug>
 #include <QThread>
+#include <QTranslator>
 #include <Core/dataparser.h>
 #include <Core/tcpclient.h>
 #include <Core/screenchecker.h>
@@ -58,6 +59,7 @@ private slots:
 
 private:
     Ui::MainWindow *ui;
+    QTranslator translator;
     TCPClient *client;
     DataParser *dataParser;
     UpdateController *updateController;
@@ -78,6 +80,7 @@ private:
     void LostConnection();
     void CheckLoginResult(ServerAuthorization * serverAuth);
     void CheckAppAvailable();
+    void checkLanguage(QString language);
     void autoStart();
     void loadStaticData();
 };