Improve UX of account deletion functionality

[letehaha]

When deleting accounts, we need to add a confirmation message if there're any transactions associated with that account. The message should warn the user that all associated transactions, and the history of that transactions will be forever lost (maybe consider soft delete until 30 days).

To check for transactions, firstly check if there're any local ones, then make a call to the API.

If there're no transactions associated, anyway show a confirmation message asking if the user sure about his action.

It should be a modal.