[IMP] crm,website_crm_partner_assign: change some labels

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        |
------------------------------------------------------------------------------------------
| 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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