Added automatic error handling to show a message box

I18N Commander/UI WinForms/ExtensionsError.cs

@@ -0,0 +1,15 @@
+using Processor;
+
+namespace UI_WinForms;
+
+public static class ExtensionsError
+{
+    public static ProcessorResult<TResult> ProcessError<TResult>(this ProcessorResult<TResult> result)
+    {
+        if (result.Successful)
+            return result;
+        
+        MessageBox.Show(result.ErrorMessage, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
+        return result;
+    }
+}