1👍
Finally found!
http://codestrian.com/index.php/2015/06/26/a-guide-to-setting-up-django-logging-on-linux/
'rotate_file':{
'level': 'ERROR',
'class': 'logging.handlers.RotatingFileHandler',
'filename': os.path.join(BASE_DIR, 'log/error.log'),
'formatter': 'verbose',
'maxBytes': 10485760,
'backupCount': 20,
'encoding': 'utf8'
},
and the last line is the most important: 'encoding': 'utf8'
Source:stackexchange.com