Discussed at Collaboration team meeting, July 7 2015 -- we may be able to do this with a "Mute" button on Echo items that you don't want to hear about anymore.
Needs more discussion + spec.
I'm getting link notifications for each translation to a page.
For this particular case, the simplest solution is to exclude all translations. When they visit the original, they will still see the translation bar at the top letting them go to their language.
I filed this as a more general bug, since there might be other categories or types of pages to exclude from this notification later.