run addon failed > name 'unicode' is not defined

[1266]

After installing grass 7.8.3 on debian buster my python2 scripts does not work anymore. Error message :

Traceback (most recent call last):
  File "/usr/local/grass78/gui/wxpython/gui_core/forms.py",
line 2866, in ParseCommand

blackList=_blackList)
  File "/usr/local/grass78/etc/python/grass/script/task.py",
line 522, in parse_interface

tree = etree.fromstring(get_interface_description(name))
  File "/usr/local/grass78/etc/python/grass/script/task.py",
line 498, in get_interface_description

"\n\nDetails: <{det}>").format(cmd=cmd, det=decode(cmderr)))
grass.exceptions
.
ScriptError
:
Unable to fetch interface description for command
'<r.wtg.visibility>'.
Details: <Traceback (most recent call last):
  File
"/home/frank/.grass7/addons/scripts/r.wtg.visibility", line
299, in <module>
    from grass.pygrass.utils import set_path
  File
"/usr/local/grass78/etc/python/grass/pygrass/utils.py", line
7, in <module>
    import grass.lib.gis as libgis
  File "/usr/local/grass78/etc/python/grass/lib/gis.py",
line 4
SyntaxError: Non-ASCII character '\xc3' in file
/usr/local/grass78/etc/python/grass/lib/gis.py on line 5,
but no encoding declared; see
http://python.org/dev/peps/pep-0263/ for details
>
During handling of the above exception, another exception
occurred:
Traceback (most recent call last):
  File "/usr/local/grass78/gui/wxpython/core/gconsole.py",
line 493, in RunCmd

task = GUI(show=None).ParseCommand(command)
  File "/usr/local/grass78/gui/wxpython/gui_core/forms.py",
line 2868, in ParseCommand

raise gcmd.GException(e.value)
core.gcmd
.
GException
:
Unable to fetch interface description for command
'<r.wtg.visibility>'.
Details: <Traceback (most recent call last):
  File
"/home/frank/.grass7/addons/scripts/r.wtg.visibility", line
299, in <module>
    from grass.pygrass.utils import set_path
  File
"/usr/local/grass78/etc/python/grass/pygrass/utils.py", line
7, in <module>
    import grass.lib.gis as libgis
  File "/usr/local/grass78/etc/python/grass/lib/gis.py",
line 4
SyntaxError: Non-ASCII character '\xc3' in file
/usr/local/grass78/etc/python/grass/lib/gis.py on line 5,
but no encoding declared; see
http://python.org/dev/peps/pep-0263/ for details
>
During handling of the above exception, another exception
occurred:
Traceback (most recent call last):
  File "/usr/local/grass78/gui/wxpython/gui_core/prompt.py",
line 413, in OnKeyPressed

self._runCmd(self.GetCurLine()[0].strip())
  File "/usr/local/grass78/gui/wxpython/gui_core/prompt.py",
line 120, in _runCmd

self.promptRunCmd.emit(cmd=cmd)
  File
"/usr/local/grass78/etc/python/grass/pydispatch/signal.py",
line 229, in emit

dispatcher.send(signal=self, *args, **kwargs)
  File "/usr/local/grass78/etc/python/grass/pydispatch/dispa
tcher.py", line 349, in send

**named
  File "/usr/local/grass78/etc/python/grass/pydispatch/robus
tapply.py", line 60, in robustApply

return receiver(*arguments, **named)
  File
"/usr/local/grass78/gui/wxpython/gui_core/goutput.py", line
120, in <lambda>

self._gconsole.RunCmd(command=cmd))
  File "/usr/local/grass78/gui/wxpython/core/gconsole.py",
line 496, in RunCmd

message=unicode(e),
NameError
:
name 'unicode' is not defined

---

If I add

# -*- coding:UTF-8 -*-

on first line in /usr/local/grass78/etc/python/grass/lib/gis.py and /usr/local/grass78/etc/python/grass/lib/raster.py my scripts seem to work (gui dispalyed)

my LOCAL is LANG=fr_FR.UTF-8