Translations of custom fields in email templates

I have encounter an  issue when translating NetSuite fields into German language.

We have defined a workflow that is sending an email template attached using some of case’s custom fields. These custom fields have translations to German.

While a user that is using German as his system language preferences  is submitting a new case – the email is sent with custom fields in German.

Is there a way to define that these fields will be sent only at English,  not matter what is the user’s system language preferences?