[MERGE][IMP] sale_*: report and portal fine tuning

This merge changes lot of small things in sale modules. The 3
main points are
- Sales Orders form view: reorganize fields for a better usability
and renaming labels
- Sale PDF report: renaming labels and titles, moving some report section
- Quotation Portal: improving style, moving section and renaming labels

Task-1920476

closes odoo/odoo#30550

Signed-off-by: Jérome Maes (jem) <jem@openerp.com>