yapf: support non ascii code

bt5/erp5_yapf/ExtensionTemplateItem/portal_components/extension.erp5.YAPF.py

@@ -4,9 +4,11 @@ def ERP5Site_formatPythonSourceCode(self, code):
   from yapf.yapflib.yapf_api import FormatCode
   try:
     return FormatCode(
-        code, style_config={
+        unicode(code, 'utf8'),
+        style_config={
             'indent_width': 2,
-            'based_on_style': 'pep8'
-        })[0]
+            'based_on_style': 'pep8',
+            #          'SPLIT_BEFORE_FIRST_ARGUMENT': True # XXX not sure about this one
+        })[0].encode('utf8')
   except SyntaxError, _:
     return code