[FIX] account_margin: display correct tooltip in report

Issue
-----
The tooltip help text doesn't match the actual calculation made in the product margins report.

opw-3792181

closes odoo/odoo#160375

X-original-commit: aa8a769d5bc15e01ae1f37271d16c42e4d18df40
Signed-off-by: Brice Bartoletti (bib) <bib@odoo.com>

addons/product_margin/i18n/product_margin.pot

@@ -315,5 +315,5 @@ msgstr ""
 
 #. module: product_margin
 #: model:ir.model.fields,help:product_margin.field_product_product__total_margin
-msgid "Turnover - Standard price"
+msgid "Turnover - Total cost"
 msgstr ""

addons/product_margin/models/product_product.py

@@ -39,7 +39,7 @@ class ProductProduct(models.Model):
     normal_cost = fields.Float(compute='_compute_product_margin_fields_values', string='Normal Cost',
         help="Sum of Multiplication of Cost price and quantity of Vendor Bills")
     total_margin = fields.Float(compute='_compute_product_margin_fields_values', string='Total Margin',
-        help="Turnover - Standard price")
+        help="Turnover - Total cost")
     expected_margin = fields.Float(compute='_compute_product_margin_fields_values', string='Expected Margin',
         help="Expected Sale - Normal Cost")
     total_margin_rate = fields.Float(compute='_compute_product_margin_fields_values', string='Total Margin Rate(%)',