Visiting is fine but if you want to get involved in the discussion, do you think you should master their language instead of just translating from your language to the other person's local board language because every term, gist, and some vocabulary will have a different meaning?
It would seem strange because I have also found members from other local boards entering my local board in Indonesian, the language is even too stiff.
I think it comes back to your goal. If you just want to know what others are discussing right now, learning a new language is probably a tough thing to do. I'm interested in Japanese and Korean but I don't think making a new thread on the Japanese or Korean sub-boards is the best thing to do.
I also think that people who visit and make posts with Google Translate (but never explicitly said so) are quite annoying to some extent, but I don't mind if OP is interested in Indonesian and tries to make posts on the local board as long as he mentions that he's trying to learn the language.