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### Issue description
The datadir field on the debug window displays incorrectly if the profile folder name is accented.

### How to reproduce
1. Create a profile with accented profile folder name (àèìòùáéíóú)
2. Run bitcoin core with the default datadir
3. Go to the debug window and look at the datadir field

### Expected behaviour
The datadir folder path should display correctly.

### Actual behaviour
Accented characters display as a unknown character question mark.

### Screenshots
![Debug Window](https://cloud.githubusercontent.com/assets/11365204/20029647/41dee90e-a352-11e6-8784-e5a48798d62e.png)


### Confirmed affected versions
The bug has been tested on the following implementations:

- v0.13.1 from source cross-compiled for Windows x64 on a Ubuntu 14.04 enviroment
- 0.13.0 official Windows x64 binary

### Additional debug info
Copying and pasting the text into a program that is known to support accented characters (Such as Notepad++) still displays unknown character symbols.
{
    if (!optionsModel)
        return;
    if (netManager != NULL)
        delete netManager;
    
    netManager = new QNetworkAccessManager(this);
    QNetworkProxy proxy;
    
    if (optionsModel->getProxySettings(proxy)) {
        netManager->setProxy(proxy);
        qDebug() << "PaymentServer::initNetManager: Using SOCKS5 proxy" << proxy.hostName() << ":" << proxy.port();
    }
    else
        qDebug() << "PaymentServer::initNetManager: No active proxy server found.";
    connect(netManager, SIGNAL(finished(QNetworkReply*)),
            this, SLOT(netRequestFinished(QNetworkReply*)));
    connect(netManager, SIGNAL(sslErrors(QNetworkReply*, const QList<QSslError> &)),
            this, SLOT(reportSslErrors(QNetworkReply*, const QList<QSslError> &)));
}
void PaymentServer::uiReady()