When customer creates an account in language other than english (e.g. german) Magento sends an email using default english template account_new.html. Email template account_new.html in app/locale/de_DE/template/email seems to be ignored.
It happens only after creating a new account. When you place an order, subscribe to a newsletter etc. Magento sends correct emails depending on customer’s language settings.
How to fix this please?