management: decode ics summary (fixes #18044)

tests/test_api.py

@@ -1559,7 +1559,8 @@ def ics_data(local_user):
 
     FormDef.wipe()
     formdef = FormDef()
-    formdef.name = 'test'
+    formdef.url_name = 'test'
+    formdef.name = 'test\xc3\xa9'
     formdef.workflow_roles = {'_receiver': role.id}
     formdef.fields = [
         fields.StringField(id='0', label='foobar', varname='foobar'),

wcs/backoffice/management.py

@@ -1604,6 +1604,7 @@ class FormPage(Directory):
         if 'anonymise' in get_request().form:
             # api/ will let this pass but we don't want that.
             raise errors.AccessForbiddenError()
+        charset = get_publisher().site_charset
         self.check_access('ics')
         user = get_user_from_api_query_string('ics') or get_request().user
 
@@ -1639,7 +1640,7 @@ class FormPage(Directory):
                             get_request().get_server().lower(),
                             formdef.url_name,
                             formdata.id)
-                    vevent.add('summary').value = formdata.get_display_name()
+                    vevent.add('summary').value = unicode(formdata.get_display_name(), charset)
                     vevent.add('dtstart').value = make_datetime(formdata.data[datefield_field_id])
                     vevent.dtstart.value_param = 'DATE'
                     vevent.add('url').value = formdata.get_url(backoffice=True)