rtMedia Email notification

Using Buddypress and rtMedia… when someone comments on a photo, email gets sent as follows –

Fred replied to one of your updates: “nice photo” Go to the discussion to reply or catch up on the conversation.

I would like to be able to edit this to something along the lines of “Fred commented on one of your photos” etc (for rtmedia_updates ONLY – leaving other update notification emails as they currently stand).

Any suggestions on how I might achieve this?

With many thanks in advance.