This is something we had been steadily thinking about and/or working on for a while, but the influx of new Japanese members encouraged us to ship something now. It's not fully baked but it's a helpful start.
We now automatically detect (human) languages for posts and allow you to determine which languages you'd like to see in your feed. You do this in your settings. We have settings for some of the popular languages on the platform right now, but in the future it should be pretty generalized. We also make an estimation on your settings when you sign up depending on such things like your Twitter language settings.
Software development communication globally conducts itself mostly in English, but that's not how the world works and we want to make pushes for a more inclusive environment for software developers whenever possible. Language-oriented features also help preserve a better experience for English-only software developers. You're now much less likely to see a Spanish or Japanese post in your feed if you have not indicated that as a language preference.
I think a natural feature to complement some of this would be translations of great existing posts into different languages and having that functionality be fairly native to the platform. That's a matter of modeling out feature and building clear permissions settings for this sort of thing.
We still lack a lot of internationalization features within the app, but it's all a work in progress. This was a productive push to get us heading well in that direction.
Happy coding ❤️