Adding a possibility to rename download file sizes and add download size to image title

Would love to change the names from the download sizes. I just want to use a High Res and a Low Res download option, but 'original file’ and ‘medium’ sounds confusing, especially for clients. Also, would be great to add the chosen file size to the title of the downloaded file, so it gets the extension of filename-highres.jpeg for example. You cannot currently determine the resolution at which the photo was downloaded from the downloaded file itself.