[FIX] stock: dropshiping delivery slip in client's language

Steps to reprodue:
- Create a dropshipped product
- Sell the product to a client with a different language set
- Print the delivery slip

Bug:
delivery slip is currently being printed in the vendor's language

Fix:
Print the delivery slip in the client language when possible

opw-3193015

closes odoo/odoo#121305

Signed-off-by: Adrien Widart (awt) <awt@odoo.com>