The source node in most cases contains the sample message as written by the developer. If it looks like a dot-delimitted string such as "form.label.firstname", then the developer has not provided a default message.

Personalization Personalizacja key: role.policy.personalization Personalization / All functions Personalizacja / Wszystkie funkcje key: role.policy.personalization.all_functions Personalization / Edit Personalizacja / Edycja key: role.policy.personalization.edit Personalization / View Personalizacja / Widok key: role.policy.personalization.view