Force locale for excluded pages

[aitortomas]

I am using the auto mode and excluding some pages from localization.
Is there a way to "force" the locale on those pages? It takes the default locale.

My use case:
I have a page that only exists in one locale (not the default one) therefore I exclude that page. But that page also uses a layout that includes localized strings (like the header and the footer). I was thinking something like being able to add in the front matter of the page the locale like locale: fr so, even though the page is excluded, it still works with the same localized layout.