[FIX] fleet: change Co2 text to CO2

Steps:
- Install fleet.
- Create new. Select a car.
- Goto `Model` page.
- Below CO2 Emissions string there is Co2 Standard string.

Issue:
- In the Engine section, there is a `CO2 Emissions` and a `Co2 Standard` field.
If these are both referring to carbon dioxide, then they should be written
consistently in the same format (CO2). Currently, one has a lowercase `o` while
the other (correct) one has a capital `O`.

Fix:
We are adding the necessary string.

task-3498197

closes odoo/odoo#139761

X-original-commit: 8b4a22baa92f196361f1ef622b55312015cf8128
Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com>

addons/fleet/i18n/fleet.pot

@@ -304,6 +304,11 @@ msgstr ""
 msgid "CO2 Emissions g/km"
 msgstr ""
 
+#. module: fleet
+#: model:ir.model.fields,field_description:fleet.field_fleet_vehicle__co2_standard
+msgid "CO2 Standard"
+msgstr ""
+
 #. module: fleet
 #: model:ir.model.fields,help:fleet.field_fleet_vehicle__co2
 msgid "CO2 emissions of the vehicle"
@@ -417,7 +422,6 @@ msgid "Closed"
 msgstr ""
 
 #. module: fleet
-#: model:ir.model.fields,field_description:fleet.field_fleet_vehicle__co2_standard
 #: model:ir.model.fields,field_description:fleet.field_fleet_vehicle_model__co2_standard
 msgid "Co2 Standard"
 msgstr ""

addons/fleet/models/fleet_vehicle.py

@@ -89,7 +89,7 @@ class FleetVehicle(models.Model):
     horsepower_tax = fields.Float('Horsepower Taxation', compute='_compute_model_fields', store=True, readonly=False)
     power = fields.Integer('Power', help='Power in kW of the vehicle', compute='_compute_model_fields', store=True, readonly=False)
     co2 = fields.Float('CO2 Emissions', help='CO2 emissions of the vehicle', compute='_compute_model_fields', store=True, readonly=False, tracking=True, group_operator=None)
-    co2_standard = fields.Char(compute='_compute_model_fields', store=True, readonly=False)
+    co2_standard = fields.Char('CO2 Standard', compute='_compute_model_fields', store=True, readonly=False)
     category_id = fields.Many2one('fleet.vehicle.model.category', 'Category', compute='_compute_model_fields', store=True, readonly=False)
     image_128 = fields.Image(related='model_id.image_128', readonly=True)
     contract_renewal_due_soon = fields.Boolean(compute='_compute_contract_reminder', search='_search_contract_renewal_due_soon',