[FIX] l10n_multilang: overwrite existing translations

When a record is created in a different language than English, empty
translations are created using the _set_ids method for translatable fields.

l10n_multilang makes the account translatable, an empty translation is created
when the CoA data is processed.

After the CoA installation, l10n_multilang transfer the translations of the
account templates to the related accounts.

No need to create translation terms again, use _set_ids to update the existing
translations.

This will prevent a cause of translation duplication, forbidden in the future by
160d657704037

opw-1832071
Closes #24158

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