For model_terms translated fields if a translation for a lang(fr_FR) has never been defined before this commit when update translations for both en_US and fr_FR, the new translation for fr_FR cannot be saved. after this commit new translations can be correctly saved when en_US and fr_FR are updated at the same time. closes odoo/odoo#135103 X-original-commit: ef4b195eeac178a14eb47f4e6cc61ddc97f78866 Signed-off-by: Raphael Collet <rco@odoo.com> Signed-off-by: Chong Wang (cwg) <cwg@odoo.com>