In some version of ubuntu with GNOME, the arrow is not available. We replace the arrow already defined by the unicode decimal code of the arrow and remove the arrow separator for the datepicker (a dash is used by default). task-2655272 closes odoo/odoo#80700 X-original-commit: ebd0d68280b59954df17f3a56675d194b1e8f70b Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>