Thank you for your guidance. I tried the method that you suggested but could not get it to work (no email was sent). I tried many different things and was finally able to get it to perform as we needed. In case it is helpful to others who may want to do the same kind of thing, here is how we got it to work.
We made a copy of "CB Activity - Comment Notification" system action in CB Auto Actions then change it to an Email action.
We used [var2_user_id] for the To field under the Action tab
We used language substitution strings for the Subject and Body fields. Important here was that we used [cb:userdata field="username" user="#me"/] to show the username of the person who posted the comment
We removed all conditions that were listed under the Conditions tab
Then it finally would send an email, but it was not observing the language parameter for the receiving user.
So then we replaced [var2_user_id] with just [user_id] in the To field. Then it would send the email in the proper language for the receiver.
krileon
