Add automatic "Refund" label in the wallet when an invoice is refunded

[pavlenex]

Is your feature request related to a problem? Please describe.
It would be good to add a "Refund" label when doing a refund.

Describe the solution you'd like
Add an automatic Refund label similar to "Invoice" or "Payout" inside the wallet.

[NicolasDorier]

it is not good first issue. This is quite difficult.
Why payout is not good enough?

[pavlenex]

@NicolasDorier I thought replicating similar behavior to invoices would be enough. Removed the label.
You don't get payout label when issuing a refund. Is that expected behavior or a bug?

I think refund sounds way more understandable to people than payout. Payout should be for payouts and refund for refund even though it's technically same concept, people don't know this.