Purpose ======= If the partner was removed after the user open the email on the Gmail side, return a clean error message instead of raising a traceback. Add translations for the new strings in the plugin. Links ===== Task-2567566 Followup of odoo/odoo#73653 See odoo/mail-client-extensions#15 closes odoo/odoo#75076 X-original-commit: e782c85b95aed30dd38bd30c29e57a9acc540a49 Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>