As part of the back2basics, the stage messages were modified to be clearer
* when an opportunity is lost previously 2 separated messages where
created in the chatter (one for the reason, one for the active state)
now, one message is created with both infos;
* new message when an opportunity is restored;
There where also some fixes to typos, and an the probability of a lead
to be successful received a new title "estimated by Odoo".
Task 2026297
closesodoo/odoo#35308
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>