key backup: recover reminder

[manuroe]

Show a banner on the home screen to allow the end user to recover their keys from an existing backup.
That will be useful when they log in on a new device.

[manuroe]

In term of design, we can reuse #254 but with a different wording.

[lampholder]

/me gets together some wording

[lampholder]

Hmm, are we certain we want to invite newly-logged-in users to restore keys from backup in all circumstances?

[lampholder]

How about this:

Secure Message Recovery

Secure Message Recovery has been set up on your account.

Secure Message Recovery securely backs up your secure message decryption keys to the server. To read your old secure messages on this device, restore from backup now.

[ Restore from backup] [ Not now ]

[manuroe]

@lampholder, we were looking for a shorter text like the one for the setup reminder (https://app.zeplin.io/project/5b857c64b1747a2c472290da/screen/5c46041735c1a337cd9253ce).

[lampholder]

Right - I'm not totally sure that we do want to prompt people to restore from backup, but if we do:

Run Secure Message Recovery

to read encrypted message history on this device

Is that short enough?

[manuroe]

Yes, thanks!