fix a bug and add multiple language for some menu

AssetStudioGUI/App.config

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+	<appSettings>
+		<add key="language" value="en-US"/>
+	</appSettings>
+</configuration>

AssetStudioGUI/AssetStudioGUI.csproj

@@ -67,6 +67,16 @@
 		<PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
 	</ItemGroup>
 
+	<ItemGroup>
+	  <Reference Include="System.Configuration" />
+	</ItemGroup>
+
+	<ItemGroup>
+	  <None Update="App.config">
+	    <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+	  </None>
+	</ItemGroup>
+
 	<Target Name="CopyExtraFiles" AfterTargets="AfterBuild">
 		<Copy SourceFiles="$(SolutionDir)AssetStudioFBXNative\bin\Win32\$(Configuration)\AssetStudioFBXNative.dll" DestinationFolder="$(TargetDir)x86" ContinueOnError="true" />
 		<Copy SourceFiles="$(SolutionDir)AssetStudioFBXNative\bin\x64\$(Configuration)\AssetStudioFBXNative.dll" DestinationFolder="$(TargetDir)x64" ContinueOnError="true" />

AssetStudioGUI/AssetStudioGUIForm.cs

@@ -8,6 +8,7 @@
 using System.Drawing;
 using System.Drawing.Text;
 using System.Globalization;
+using System.Configuration;
 using System.IO;
 using System.Linq;
 using System.Runtime.InteropServices;
@@ -42,6 +43,7 @@ partial class AssetStudioGUIForm : Form
         private FMOD.MODE loopMode = FMOD.MODE.LOOP_OFF;
         private uint FMODlenms;
         private float FMODVolume = 0.8f;
+
 
         #region TexControl
         private static char[] textureChannelNames = new[] { 'B', 'G', 'R', 'A' };
@@ -90,12 +92,16 @@ partial class AssetStudioGUIForm : Form
 
         private GUILogger logger;
 
+        private System.Configuration.Configuration cfg=ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
+
         [DllImport("gdi32.dll")]
         private static extern IntPtr AddFontMemResourceEx(IntPtr pbFont, uint cbFont, IntPtr pdv, [In] ref uint pcFonts);
 
         public AssetStudioGUIForm()
         {
-            Thread.CurrentThread.CurrentCulture = new CultureInfo("en-US");
+            string language = cfg.AppSettings.Settings["language"].Value;
+            Thread.CurrentThread.CurrentCulture = new CultureInfo(language);
+            Thread.CurrentThread.CurrentUICulture= new CultureInfo(language);
             InitializeComponent();
             Text = $"AssetStudioGUI v{Application.ProductVersion}";
             delayTimer = new System.Timers.Timer(800);
@@ -1384,6 +1390,11 @@ private void ExportMergeObjects(bool animation)
             {
                 var gameObjects = new List<GameObject>();
                 GetSelectedParentNode(sceneTreeView.Nodes, gameObjects);
+                if (gameObjects.Count <= 0)
+                {
+                    StatusStripUpdate("No Object can be exported");
+                    return;
+                }
                 var saveFileDialog = new SaveFileDialog();
                 saveFileDialog.FileName = gameObjects[0].m_Name + " (merge).fbx";
                 saveFileDialog.AddExtension = false;
@@ -2046,6 +2057,34 @@ private void toolStripMenuItem15_Click(object sender, EventArgs e)
             logger.ShowErrorMessage = toolStripMenuItem15.Checked;
         }
 
+        private void englieshToolStripMenuItem_Click(object sender, EventArgs e)
+        {
+            ChangeLanguage(LanguageType.English);
+        }
+
+        private void chineseToolStripMenuItem_Click(object sender, EventArgs e)
+        {
+            ChangeLanguage(LanguageType.Chinese);
+        }
+
+        private void ChangeLanguage(LanguageType lang)
+        {
+            switch (lang)
+            {
+                case LanguageType.Chinese:
+                    cfg.AppSettings.Settings["language"].Value = "zh-Hans";
+                    cfg.Save();
+                    break;
+                default:
+                    cfg.AppSettings.Settings["language"].Value = "";
+                    cfg.Save();
+                    break;
+            }
+            MessageBox.Show("Please restart the software to set the application language");
+        }
+
+
+
         private void glControl1_MouseWheel(object sender, MouseEventArgs e)
         {
             if (glControl1.Visible)