[FIX] product: help for field standard_price

Step to reproduce:
1) create a product with, the "Product Type" as
"Storable Product" + A "Product Category" with a "Costing Method"
set in "FIFO" mode and the Inventory Valuation in "Automated".

2) create a Purchase Order for 1 unit of that product and set the unit
price to 10.00. Confirm Order -> Receive Products -> Validate
(the delivery) -> Apply

3) create a second Purchase Order for 1 unit of the same product but
set the unit price to a different price, like 20.00. Confirm Order ->
Receive Products -> Validate (the delivery) -> Apply

4) create a Sales Orders for 1 unit -> Confirm -> Smart button
Delivery -> Validate -> Apply

5) check the cost on the product form of that product.

On the V13 it will be $10, so its the last unit that left the stock
On V14 and upper, it will be $20, so the next product that will leave
the stock.

The help popup for the field "standard_price" doesn't reflect the
correct behavior. It's the standard price for the next unit instead
of the last one.

closes odoo/odoo#84289

X-original-commit: 9e0a529b603302653dac2a8fb692472fc500c147
Signed-off-by: William Henrotin (whe) <whe@odoo.com>
Signed-off-by: Bruno-brsy <brsy@odoo.com>

addons/product/i18n/product.pot

@@ -1288,7 +1288,7 @@ msgstr ""
 #: model:ir.model.fields,help:product.field_product_template__standard_price
 msgid ""
 "In Standard Price & AVCO: value of the product (automatically computed in AVCO).\n"
-"        In FIFO: value of the last unit that left the stock (automatically computed).\n"
+"        In FIFO: value of the next unit that will leave the stock (automatically computed).\n"
 "        Used to value the product when the purchase cost is not known (e.g. inventory adjustment).\n"
 "        Used to compute margins on sale orders."
 msgstr ""

addons/product/models/product.py

@@ -110,7 +110,7 @@ class ProductProduct(models.Model):
         digits='Product Price',
         groups="base.group_user",
         help="""In Standard Price & AVCO: value of the product (automatically computed in AVCO).
-        In FIFO: value of the last unit that left the stock (automatically computed).
+        In FIFO: value of the next unit that will leave the stock (automatically computed).
         Used to value the product when the purchase cost is not known (e.g. inventory adjustment).
         Used to compute margins on sale orders.""")
     volume = fields.Float('Volume', digits='Volume')

addons/product/models/product_template.py

@@ -75,7 +75,7 @@ class ProductTemplate(models.Model):
         inverse='_set_standard_price', search='_search_standard_price',
         digits='Product Price', groups="base.group_user",
         help="""In Standard Price & AVCO: value of the product (automatically computed in AVCO).
-        In FIFO: value of the last unit that left the stock (automatically computed).
+        In FIFO: value of the next unit that will leave the stock (automatically computed).
         Used to value the product when the purchase cost is not known (e.g. inventory adjustment).
         Used to compute margins on sale orders.""")