Hello Drew_C
We use to write email template in Studio > Text Editor > Email Text, there you can choose email template and select the language and made appropriate changes.
For a thread reply it will auto generate links for that particular message
/t5/forum/thread/m-p/123456/emcs_t/N6VZws2U85Sjg[truncated]nDzmRwWjN2#M123
Where #M123 is new comment id.
We wrote a line of code ${emailUrls.getMessagePageUrl($message)} and it automatically generates the link when it send an email, so I don't think we can customise it to
/t5/forum/thread/m-p/123456
Regards,
Abhishek Gupta