Add language filtering to simple query?

[rahulbot]

We can filter by language, but many new users don't know that. We could add a language drop down to the simple query interface to surface this for learning. One take on how this might look is below, which trades off negation space to add this drop down. My ideas is that you would only be able to pick one language via this drop down and it could list the top 50 languages or something by frequency in our index.

[pgulley]

I think the biggest difficulty here is just aquiring that list of languages and sorting them in a relevant fashion- and only difficult in the sense that it's a lot of busy work