extensions-app: Improve "noshell" status page
When running Extensions outside GNOME, a status page appears informing that the extensions can't be listed. However, the status page has some UI issues:
- It doesn't have an icon
- Doesn't use header capitalization
- Using "we're very sorry" in the description is an uncommon phrasing tone that isn't used in other GNOME apps. The description is also too verbose
- "Something's gone wrong" is a vague explanation
Fix all of the issues above.
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Edited by Automeris naranja