[10.0][FIX] l10n_it_fatturapa_out: Error sting encoding

[SimoRubi]

Steps to reproduce:
0. Create an empty DB (no demo data) and install l10n_it_fatturapa_out

1. In the company, set VAT and phone number
2. Create a customer invoice for a newly created customer and a newly created product
3. From context menu, select Export Electronic Invoice and confirm

Behavior before this PR:

Error

2018-12-06 14:08:17,125 15207 ERROR odoo10-9321 odoo.http: Exception during JSON request handling.
Traceback (most recent call last):
  File "/home/user/work/odoo10/odoo/odoo/http.py", line 642, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "/home/user/work/odoo10/odoo/odoo/http.py", line 684, in dispatch
    result = self._call_function(**self.params)
  File "/home/user/work/odoo10/odoo/odoo/http.py", line 334, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/home/user/work/odoo10/odoo/odoo/service/model.py", line 101, in wrapper
    return f(dbname, *args, **kwargs)
  File "/home/user/work/odoo10/odoo/odoo/http.py", line 327, in checked_call
    result = self.endpoint(*a, **kw)
  File "/home/user/work/odoo10/odoo/odoo/http.py", line 942, in __call__
    return self.method(*args, **kw)
  File "/home/user/work/odoo10/odoo/odoo/http.py", line 507, in response_wrap
    response = f(*args, **kw)
  File "/home/user/work/odoo10/odoo/addons/web/controllers/main.py", line 899, in call_button
    action = self._call_kw(model, method, args, {})
  File "/home/user/work/odoo10/odoo/addons/web/controllers/main.py", line 887, in _call_kw
    return call_kw(request.env[model], method, args, kwargs)
  File "/home/user/work/odoo10/odoo/odoo/api.py", line 689, in call_kw
    return call_kw_multi(method, model, args, kwargs)
  File "/home/user/work/odoo10/odoo/odoo/api.py", line 680, in call_kw_multi
    result = method(recs, *args, **kwargs)
  File "/home/user/work/odoo10/l10n-italy/l10n_it_fatturapa_out/wizard/wizard_export_fatturapa.py", line 784, in exportFatturaPA
    company, partner, fatturapa)
  File "/home/user/work/odoo10/l10n-italy/l10n_it_fatturapa_out/wizard/wizard_export_fatturapa.py", line 726, in setFatturaElettronicaHeader
    self.setCedentePrestatore(company, fatturapa)
  File "/home/user/work/odoo10/l10n-italy/l10n_it_fatturapa_out/wizard/wizard_export_fatturapa.py", line 320, in setCedentePrestatore
    company)
  File "/home/user/work/odoo10/l10n-italy/l10n_it_fatturapa_out/wizard/wizard_export_fatturapa.py", line 211, in _setDatiAnagraficiCedente
    'Electronic Invoice)' % company.name
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 22: ordinal not in range(128)

Behavior after this PR:
Error popup (expected):

Fiscal position for electronic invoice not set for company My Company. (Go to Accounting / Configuration / Settings / Electronic Invoice)