There is no English option in the language picker because why learn English when it's your native language...?
Granted, it's quite unexpected so we'll think of smthg better.
We need the web plugin of VLC for fleex with the windowless mode.
The plugin shipped with the 2.0.6 version of VLC works great on PC but have strong performance issues on the mac (in windowless mode).
The VideoLAN team is working on it and as soon as this problem is fixed, fleex player will also be available for iOS.
As for linux, we're just ignorant... We're looking for someone to package the app for us.