[IMP]Calendar,crm,fleet,hr,hr_recruitment,mass_mailing,note,project/proj...

Task: https://www.odoo.com/web#id=8812&view_type=form&model=project.task&menu_id=3942&action=327
pad : https://pad.odoo.com/p/r.00aDOS0i0SOXSuwv
get_unaccent_wrapper function check that wheather unaccent module is install or not in postgresql
if not install, query will not work as function will return without unaccent.