[keys] Better error messages when unable to unlock keystore (#222)

cmd/subcommands/keys.go

@@ -56,7 +56,7 @@ func getPassphrase() (string, error) {
 		pw := strings.TrimSuffix(string(dat), "\n")
 		return pw, nil
 	} else if userProvidesPassphrase {
-		fmt.Println("Enter passphrase:")
+		fmt.Println("Enter wallet keystore passphrase:")
 		pass, err := terminal.ReadPassword(int(os.Stdin.Fd()))
 		if err != nil {
 			return "", err

pkg/store/local.go

@@ -43,7 +43,7 @@ func LocalAccounts() []string {
 
 var (
 	describe              = fmt.Sprintf("%-24s\t\t%23s\n", "NAME", "ADDRESS")
-	NoUnlockBadPassphrase = errors.New("could not unlock account with passphrase, perhaps need different phrase")
+	NoUnlockBadPassphrase = errors.New("could not unlock wallet with given passphrase")
 )
 
 // DescribeLocalAccounts will display all the account alias name and their corresponding one address