Hi Danielle,
Did you manage to get a resolution to these issues? If so, I would be very interested to hear it. I also have issues with my multilanguage site (paid Newsletter Plugin subscription, using Polylang).
I have set up Newsletter pages (a default "All languages fall back" page, along with "Newsletter EN" and "Newsletter FR" pages) but the Activation message when a new member signs up always defaults to the English and subscribers aren't assigned a language.
I would appreciate any help anyone can provide.
Thanks!