Using a Bitcoin-Qt v0.16.0 ([downloaded from bitcoin page](https://bitcoin.org/bin/bitcoin-core-0.16.0/bitcoin-0.16.0-osx.dmg)) in an macOS High Sierra 10.13.4 

When I start after a fresh install Bitcoin-Qt as a mainnet node and wallet, the wallet prompt that about 203gb is going to be used in my disk
![image](https://user-images.githubusercontent.com/20187136/39899688-ba820bfe-5493-11e8-87d9-460ed5716a02.png)

When I start the node and wallet as testnet, shows the same message about the 203gb disk usage
![image](https://user-images.githubusercontent.com/20187136/39899756-17b31214-5494-11e8-8a57-60e604e74afb.png)

It seems that the second time the message is wrong, due that the testnet database uses about 14gb.
ui->storageLabel->setText(ui->storageLabel->text().arg(tr(PACKAGE_NAME)));
    ui->lblExplanation1->setText(ui->lblExplanation1->text()
        .arg(tr(PACKAGE_NAME))
        .arg(BLOCK_CHAIN_SIZE)
        .arg(2009)
        .arg(tr("Bitcoin"))
    );
    ui->lblExplanation2->setText(ui->lblExplanation2->text().arg(tr(PACKAGE_NAME)));
    uint64_t pruneTarget = std::max<int64_t>(0, gArgs.GetArg("-prune", 0));
    requiredSpace = BLOCK_CHAIN_SIZE;
    QString storageRequiresMsg = tr("At least %1 GB of data will be stored in this directory, and it will grow over time.");
    if (pruneTarget) {
        uint64_t prunedGBs = std::ceil(pruneTarget * 1024 * 1024.0 / GB_BYTES);
        if (prunedGBs <= requiredSpace) {
            requiredSpace = prunedGBs;
            storageRequiresMsg = tr("Approximately %1 GB of data will be stored in this directory.");
        }
        ui->lblExplanation3->setVisible(true);
    } else {
        ui->lblExplanation3->setVisible(false);
    }
    requiredSpace += CHAIN_STATE_SIZE;
    ui->sizeWarningLabel->setText(
        tr("%1 will download and store a copy of the Bitcoin block chain.").arg(tr(PACKAGE_NAME)) + " " +
        storageRequiresMsg.arg(requiredSpace) + " " +
        tr("The wallet will also be stored in this directory.")
    );
    startThread();
}
Intro::~Intro()