Gufw doesn't launch on debian 10

[florentbr]

== Configuration
Linux Debian 10, Gufw 17.04.1

== Description
Gufw doesn't start when the application is launched manually.

When launched via the terminal, I get this error:

 florent@KTYHJE:~$ gufw

 (gufw.py:2219): Gtk-WARNING **: Locale not supported by C library.
  Using the fallback 'C' locale.

 (process:2238): Gtk-WARNING **: Locale not supported by C library.
  Using the fallback 'C' locale.
 Traceback (most recent call last):
   File "/usr/share/gufw/gufw/gufw.py", line 30, in <module>
     gufw = Gufw(controler.get_frontend())
   File "/usr/share/gufw/gufw/gufw/view/gufw.py", line 81, in __init__
     self.winadd = Add(self)
   File "/usr/share/gufw/gufw/gufw/view/add.py", line 36, in __init__
     self.apps = AppProfiles()
   File "/usr/share/gufw/gufw/gufw/view/add.py", line 492, in __init__
     self.all_apps = self._load_from_files()
   File "/usr/share/gufw/gufw/gufw/view/add.py", line 499, in _load_from_files
     cfg.read(glob.glob('*.*'))
   File "/usr/lib/python3.6/configparser.py", line 697, in read
     self._read(fp, filename)
   File "/usr/lib/python3.6/configparser.py", line 1015, in _read
     for lineno, line in enumerate(fp, start=1):
   File "/usr/lib/python3.6/encodings/ascii.py", line 26, in decode
     return codecs.ascii_decode(input, self.errors)[0]
 UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 333: ordinal not in range(128)

== Fix

The issue is located in `/usr/share/gufw/gufw/gufw/view/add.py` line 499.
I forced the encoding to utf-8, which seems to fix the error:

 499c499
 < cfg.read(glob.glob('*.*'))
 ---
 > cfg.read(glob.glob('*.*'), 'utf-8')