Add WELCOME msg in users' mailbox
I realized that the Inbox is the first page that the user sees when accessing Odoo/freedoomcoop. When a user enters the system, its mailbox should have a Welcome msg prepared (it would be great if language based on the browsers' local settings of the user, if not, it's ok.)
The template of the message(or messages if multilingual) should be stored in a .md or .html format.