Hello White_Oz16, indeed the most convenient way to exchange messages for now is on https://github.com/aaFn/Bookmark-search-plus-2/issues
It's not as good as mails, but the advantage is that this is visible to all. I guess an alternative would be to use a Slack channel, but again this is not the most widespread method for all ..

Issues on GitHub remain easy to use, and we can even exchange files there if you do not want to enter into the pull mechanisms on Git/GitHub, which I must say is not the most natural in the world, I agree with you.

Since code and features are stabilizing, yes one of the next steps will be to take care of translation now. I will see how to organize that, and will come back in https://github.com/aaFn/Bookmark-search-plus-2/issues/62 on it.