When using the composer in batch and comment mode, the first record of the batch was used to find the language for notifications instead of the one linked to the message. Previously to odoo/odoo#99482 batch comment mode was not supported and there were always only a singleton as record ids. Now that it is supported we have to be more careful when dealing with IDs. To solve this issue we check the message res_id which effectively contains the correct record ID. Oversight of odoo/odoo#99482 Task-3035101 (Mail: Support batch-posting from composer) closes odoo/odoo#113015 Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>