[FIX] models: do not keep the old source in case of copy override

Current behaviour when duplicating a record:

    apply copy override in the user language (e.g. "%s (copy)")
    copy the previous term in all the other languages (including)

So if product was named:

    cheeses (en)
    kaas (nl)
    fromage (fr)

Duplicating the product, while in French, will result into:

    cheeses (en)
    kaas (nl)
    fromage (copie) (fr)

This is a problem if there is a unicity constrain on the field, it will be
raised (there is already a product named 'cheese')

After this PR:

Duplicating the product, while in French, will result into:

    fromage (copie) (en)
    kaas (nl)
    fromage (copie) (fr)

This applies **only** if there is an override of copy

This is detected by comparing the old and new value for the user language

Fixes #7010
Closes #22052

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