Make translation works for "Website Visitor" that was appearing when a
logged-out user open a livechat session.

note: list comprehension has to be removed since translation only search
language in direct calling method closure.

opw-2504461

closes odoo/odoo#70135

X-original-commit: 7e0cf967
Signed-off-by: Nicolas Lempereur (nle) <nle@odoo.com>