Change the designator in transaction history

[Esya]

Change Validator and To to Account to avoid misleading issues inside TransactionHistory

[tjanez]

Change Validator and To to Account to avoid misleading issues inside TransactionHistory

Perhaps it would be even better to not use the generic term Account but use the transaction's context to display a more meaningful thing.

For example, for a transfer txn where the wallet is the destination or for a reclaim escrow transaction, it would show From.

On the other had, for a transfer txn where the wallet is the source or for a add escrow transaction, it would show To.

I would also be nice if it would be unified with the Preview transaction's field names (#77).

[gparty]

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