[bisq-network/bisq] Feature request. Warning the user about wrong country bank (#3724)

[Manuel]

**Description of the problem**

When setting up a payment account, sometimes users confuse "Country Bank" with the country they live in.  This might be confusing for other users that don´t want to trade with foreign banks.  

For example if I am in France and I am using a German payment account, and in "Bank Country" I put "FR" instead of "DE", French users that do not want to trade with German banks (or any foreign banks) might trade with me thinking that they are going to trade within their country to find out they will have to trade with a foreign bank, once the are already engaged in the trade.

**Description of the feature / proposed solution**

For IBAN payment accounts, to check if the bank country matches with the first two characters of the IBAN account.  If not, warn the user with a pop up that the IBAN and bank country do not match and ask the user to review it.  Not proposing a hard data validation, just a soft warning for the user.

This feature could save us quite a few mediation cases.

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https://github.com/bisq-network/bisq/issues/3724
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