Minor aesthetics issues in AppStream for Tails Installer

I tried installing Tails Installer through GNOME Software thanks to the AppStream and it works. Still I found 3 aesthetics issues that could hopefully be easily solved:

There’s no screenshot while the XML file points to https://screenshots.debian.net/screenshots/000/014/555/large.png. I’m not sure what’s going on here.
The Website button points to https://tails.boum.org/contribute/release_process/tails-installer/ and should point to https://tails.boum.org/. I thought I fixed that already in dc8f7f7…
The bullet list in the description is broken. See screenshot in attachment.
“Tails Installer” is sometimes displayed as “Tails-installer”. See screenshot in attachment.

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Related issues

Related to #11378 (closed)

Original created by @sajolida on 12688 (Redmine)

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