<!--- Remove sections that do not apply -->

### 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 (!address.IsValid()) {
                    Q_EMIT message(tr("URI handling"), tr("Invalid payment address %1").arg(recipient.address),
                        CClientUIInterface::MSG_ERROR);
                }
                else
                    Q_EMIT receivedPaymentRequest(recipient);
            }
            else
                Q_EMIT message(tr("URI handling"),
                    tr("URI cannot be parsed! This can be caused by an invalid Bitcoin address or malformed URI parameters."),
                    CClientUIInterface::ICON_WARNING);
            return;
        }
    }
    if (QFile::exists(s)) 
    {
        PaymentRequestPlus request;
        SendCoinsRecipient recipient;
        if (!readPaymentRequestFromFile(s, request))
        {
            Q_EMIT message(tr("Payment request file handling"),
                tr("Payment request file cannot be read! This can be caused by an invalid payment request file."),
                CClientUIInterface::ICON_WARNING);
        }
        else if (processPaymentRequest(request, recipient))
            Q_EMIT receivedPaymentRequest(recipient);
        return;
    }
}
void PaymentServer::handleURIConnection()