erp5_dqe: define encoding in scripts that need it

bt5/erp5_dqe/SkinTemplateItem/portal_skins/erp5_dqe/HTTPExchange_getDQENatureCaption.py

+# encoding: utf-8
 dqe_resource_category = context.getPortalObject().portal_categories.http_exchange_resource.dqe
 # Values are hard-coded to fr, it is for Data Warehouse use and Investigation tab
 return {

bt5/erp5_dqe/SkinTemplateItem/portal_skins/erp5_dqe/HTTPExchange_getDQEResponseWording.py

+# encoding: utf-8
 resource_value = context.getResourceValue()
 if not resource_value.isMemberOf('http_exchange_resource/dqe'):
   return {}