Improve default naming of accounts

[danfinlay]

We allow so many hardware wallets now, and with Ledger any number of hardware wallet cards, it's basically impossible to keep up by just adding numbers in the order they were added.

Proposed new account naming scheme:
${accountType} ${accountType.number} account ${derivationIndex + 1}

Examples:

• If you have 2 Grid+ Lattice cards, the third account on your second card would be Lattice 2 account 3.

This is a total MVP solution that I think will make this a bit better.

Longer term, we should enable nicknaming on a per-keychain basis, and so that keychain's nickname should be auto-prepended in some easily scanable form over the account list item.

[AlexJupiter]

@danfinlay

and with Ledger any number of hardware wallet cards

Just confirming we're talking about Lattice here right?