Preboarding opening notification - language

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Hi community,

I need support on Preboarding opening notification configuration. I have configured the notification in two languages (Italian and English) and I set as default language English and I configured the Italian translation using the world icon. I want to understand the criteria by which the emails arrive to pending workers in one language or in another. This notification arrives via email before their first access in the system so this could NOT depend by the language in which they are using the system.

This is very important for us because our client has legal employers in different countries and he wants pending workers from one legal employer receive notification in English and the others in Italian.