[FIX] sale: typos

Commits 2607b200f2 and f867fc9269
introduced typos:

 - sale order instead of sales order
 - sent quotation instead of quotation sent

addons/sale/sale.py

@@ -149,7 +149,7 @@ class SaleOrder(models.Model):
     def unlink(self):
         for order in self:
             if order.state not in ('draft', 'cancel'):
-                raise UserError(_('You can not delete a quotation sent or a sale order! Try to cancel it before.'))
+                raise UserError(_('You can not delete a sent quotation or a sales order! Try to cancel it before.'))
         return super(SaleOrder, self).unlink()
 
     @api.multi

addons/sale/sale_view.xml

@@ -388,7 +388,7 @@
                 <p class="oe_view_nocontent_create">
                     Create a Quotation, the first step of a new sale.
                 </p><p>
-                    Once the quotation is confirmed, it becomes a sale order.
+                    Once the quotation is confirmed, it becomes a sales order.
                     You'll be able to invoice it and collect payments.
                     From the <i>Sales Orders</i> menu, you can track delivery
                     orders or services.