At this point in time I'm not sure if that type of thread would fit anywhere in the Emulation section. Yes, it is definitely ROM hacking, but a thread asking for suggestions on translating hacks wouldn't be able to stand on its own in the main forum and doesn't reach the requirements of the sub-forums. I think the best thing you can do is to make a post in this thread and hope for some replies.
If that's the case then you're better off contacting the creators privately and asking for their permission. Then once you've translated the game you could post a link in their threads and have them link it in the first post as well.