There is no official JB firmware with English apps only - latest one is 1.02H, which is ICS.
Good news that there are alternative firmwares based on 1.06H, which is the latest JB ROM for U30GT. Those firmwares are cleaned form Chinese apps, English is set by default and they are already rooted to expand on usability. I can recommend those firmwares:
Last one is for more advanced users because it contains CWM mod. First one is highly tweaked for better Google Play usability, etc. Second one is cleaned from Chinese apps and rooted, so it is the closest to original one.