Notifications are being sent in a single language, configuring a default language in the ‘Email Template’ section of the PMAdmin site.
This is a Product Defect (TF00775195).
The notifications should be sent based on the end-user’s QA profile’s language. For example, if the user registered using another language then the default one during the QA creation, the notifications should be sent in the registered language.
This will be fixed on a future release of the product. If you require a status update, please refer to this article and/or contact support for a hotfix referencing the defect ID TF00775195.