In crm,website_crm_partner_assign and website_crm_score there were fields with
almost the same label, which was confusing, we change those names so it
reflects better what the field is used for.
| field | module | old label | new label |
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| date_open | crm | Assigned | Assignation Date |
| date_assign | website_crm_partner_assign | Assignation Date | Partner Assignation Date |
| assign_date | website_crm_score | Assign Date | Auto Assign Date |
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