Hi, thank you for your response.
transactional emails from WooCommerce will take the locale of the user
I don’t think that’s the case though. Because the language is correct for every string that is using the ‘woocommerce’ text-domain, but not for our theme’s text-domain. Meaning if an admin has a language of English and they send out an e-mail from a Dutch sub-site, the user will recieve an e-mail that is mostly Dutch, except all of the strings that use our theme’s text-domain.