Refactor download message to use "file" instead of "video"

[bscheffbuch]

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Description of your pull request and other information

This pull request fixes issue #4260 . It is a simple edit of the displayed text to say file instead of video as sometimes the file being downloaded is not a video.

[bashonly]

of note: yt-dlp replaced video with item

[dirkf]

I also prefer "item"/"items".