Support UTF encode

Hi,

We have problems with encoding, if appears some especial character in json (like in French), the error will be,
 UnicodeDecodeError: 'utf-8' codec can't decode byte 0xe9 in position 182: invalid continuation byte

The "conflictive" part of the json is:
"nomF": "Fichiers supervisés enregistrés"

Any idea?

Thks in advance