unicode broken in notifications on windows 8.

[tshirtman]

Opening a notifications on windows 8.1 works, but unicode characters ("éàùç" and their friends) are displayed improperly, probably using a bad encoding (i would suspect a latin-1 or similar encoding).

(that's running the provided example)

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[KeyWeeUsr]

Can't reproduce on Windows 8.1 with 9dd168d and with latest master 32f8e2c on Py2 + Py3.