This is useful to prompt the user to install the `.desktop` file.
The `Description` key in `Etcher.desktop` was changed to `Comment` since
`desktop-file-validate` complained with:
Etcher.desktop: error: file contains key "Description" in group "Desktop
Entry", but keys extending the format should start with "X-"
After checking the desktop file format specification, the correct key
should be "Comment"
(https://specifications.freedesktop.org/desktop-entry-spec/latest/ar01s05.html).
See: bc6e519964 (commitcomment-17164442)
Signed-off-by: Juan Cruz Viotti <jviottidc@gmail.com>
