If you want to change the label for the State / Province, you have to do the following.
1. Login to your control panel
2. At the top right, click on Tools then Form Fields
3. Click on the Address Fields tab
4. You will see the list of fields, click Edit for the field you want to edit
5. Add / edit the information then click Save
You can do the same for all of the other fields as well (such as Zip Code etc.)
You can do that same for the Zip Code / Cod Postal.

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