[I18N] mail: fixed Spanish translation
[I18N] mail: fixed Spanish translation

saas-14 is no longer present on Transifex. A pr is still the most efficient way
to backport translations done on upper version.

Closes #16750
Fixes #16749

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo