I wonder how much sense it makes to capitalise package names here. Backticks generally mean code. So I think it should either be the package name like how you'd use it in a command (pacman -S postgresql), or not be between backticks. For packages I think it make sense to use backticks and the names like how you'd use in commands.
Why the z-spelling over s-spelling? I thought the z-spelling was purely a North America thing. (personally I always try to use the s-spelling.)
Map.get/3 doesn't work in this case. The key can contain nil. So in that case the description would be nil instead of an empty string (and the rest of the code expects a string).
i…Note: This test broke with removing the filename from this field. But this is not what it tests, and as afaict it doesn't even actually tests what it's supposed to do. Therefore I decided to just remove it instead of leaving it in what seems to be a broken state.