accounts: add ErrDecrypt

cmd/geth/accountcmd.go

@@ -263,7 +263,7 @@ func importWallet(ctx *cli.Context) {
 
 	acct, err := accman.ImportPreSaleKey(keyJson, passphrase)
 	if err != nil {
-		utils.Fatalf("Could not create the account: %v", err)
+		utils.Fatalf("%v", err)
 	}
 	fmt.Printf("Address: {%x}\n", acct.Address)
 }

cmd/geth/accountcmd_test.go

@@ -127,7 +127,7 @@ func TestWalletImportBadPassword(t *testing.T) {
 	geth.expect(`
 !! Unsupported terminal, password will be echoed.
 Passphrase: {{.InputLine "wrong"}}
-Fatal: Could not create the account: Decryption failed: PKCS7Unpad failed after AES decryption
+Fatal: could not decrypt key with given passphrase
 `)
 }