[bisq-network/bisq] Improve warning about seeds are not a data backup. (#4375)

[MwithM]

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### Description

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A user formatted his computer saving only the seed and not the backup, while having open trades. As expected, he lost Bisq data and can't access locked and reserved funds.

#### Version

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Any


### Steps to reproduce

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This is user error, not a bug: remove Bisq data and restart Bisq only with seed while having open trades.

### Screenshots

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![wallet seed and backup](https://user-images.githubusercontent.com/50149324/88455459-bc11cc80-ce75-11ea-81f3-ab14ef7ba2fa.jpg)

#### Additional info

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To help preventing this user error, I request to display a pop-up warning **before** entering the password to display the seeds, showing the text inside the red square at the screenshot above `Please note that the seed words are NOT  a replacement for a backup. You need to create a backup... Importing seed words is only recommended for emergency cases. The application will not be functional without a proper backup of database files and keys!` 

It could be nice to add the wiki page https://bisq.wiki/Backing_up_application_data for extended info.

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https://github.com/bisq-network/bisq/issues/4375
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