Issue #3595596: name the vault item in the add and edit form titles

Frank Mablyrequested to merge
issue/pdv-3595596:3595596-vault-item-form into 1.x

Names the vault item in the add/edit form page titles instead of the generic "Add structured data" / "Edit structured data" / "Edit file".

  • Add record: _title_callback -> "Add @kind" (e.g. "Add Civil status"), the kind being added.
  • Edit (a file and a structured-data record are the same pdv_item entity, so one generic callback serves both): "Edit @label", preferring the item's custom label, falling back to the kind label, and to a generic "Edit file" only for an uncategorized file with no label.
  • The custom label is encrypted, so the callback decrypts it and falls back to the clear-text kind label when the vault is locked (try/catch).
  • Bundled French translations added (Ajouter @label / Modifier @label).

phpcs (Drupal, DrupalPractice) and phpstan clean locally; verified on the dev sites.

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