It depends on what your production needs are, and how much of the gaps are filled in by unofficial libraries in the meantime (e.g. there are Rust crypto libraries, but none that are officially endorsed). Production-readiness comes in degrees, especially for a community project like Rust that has a relatively small paid team.

Although the internationalization story looks pretty bad, I'm heartened by my firm impression that no language does it well, that serious apps (like Firefox) tend to roll their own. One of our driving philosophies in Rust is to get actual production quality subsystems into the standard library by proving them in applications like Servo.