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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 false;
    if (request.IsInitialized()) {
        
        if (!verifyNetwork(request.getDetails())) {
            Q_EMIT message(tr("Payment request rejected"), tr("Payment request network doesn't match client network."),
                CClientUIInterface::MSG_ERROR);
            return false;
        }
        
        
        if (verifyExpired(request.getDetails())) {
            Q_EMIT message(tr("Payment request rejected"), tr("Payment request expired."),
                CClientUIInterface::MSG_ERROR);
            return false;
        }
    } else {
        Q_EMIT message(tr("Payment request error"), tr("Payment request is not initialized."),
            CClientUIInterface::MSG_ERROR);
        return false;
    }
    recipient.paymentRequest = request;
    recipient.message = GUIUtil::HtmlEscape(request.getDetails().memo());
    request.getMerchant(PaymentServer::certStore, recipient.authenticatedMerchant);
    QList<std::pair<CScript, CAmount> > sendingTos = request.getPayTo();
    QStringList addresses;
    Q_FOREACH(const PAIRTYPE(CScript, CAmount)& sendingTo, sendingTos) {