Added the selected data file

I18N Commander/UI WinForms/Loader.cs

@@ -2,6 +2,8 @@
 
 public partial class Loader : Form
 {
+    public string DataFile { get; set; } = string.Empty;
+    
     public Loader()
     {
         this.InitializeComponent();
@@ -9,7 +11,7 @@ public partial class Loader : Form
 
     private void loaderStart_LoadProject(object sender, string projectFilePath)
     {
-        // TODO: Call the data model
+        this.DataFile = projectFilePath;
         this.Close();
     }
 }