Improve Error Message Clarity When Moving or Copying Files to Invalid Folders

[alperozturk96]

When a user tries to move or copy valid files to an invalid folder, the error message is unclear. It should clearly indicate that the target folder path is incorrect.

For example, when a user attempts to copy a valid file to a folder named "com0," instead of displaying the message "File name is a reserved word," it should say "com0 is a reserved file name."

Note: Clients directly use the server's messages.