Add a dedicated page for the recommended apps installation

[ChristophWurst]

Todo

• redirect to this page on setup submit @ChristophWurst
• app fetch error handling @ChristophWurst
• installation error handling @ChristophWurst
• redirect when done @ChristophWurst
• Make pretty @jancborchardt

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Current state

old versions   

[rullzer]

Does the trick and already looks a lot better!

[skjnldsv]

much cleaner :p

[rullzer]

/compile fixup /

[jancborchardt]

I will only have time to look into this in the next days as I’ll be traveling. If someone else wants to have a quick look (a lot of these things look nice already on the 2FA choice page for example, maybe patterns to get from there):

• App title should be white (same as text color)
• App icon should be white (same as text color)
• App icon is a bit large in comparison to the text.
• App description text should be left-aligned
• Spacing between app title and app description is too much – could be halved
• Error should just be bold (in a <strong> element) instead of in a class="error" container
• The width of the dialog should be fixed to what we had before. See Container on update screen is too wide Container on update screen is too wide #17556
• The "Go back" link is a bit confusing? Should it be "Cancel"?

[rullzer]

/compile amend /