The server will support English but not 100% (there will be many discrepancies or obscure text, but it will all be in the course of the case brought to mind).
Localization of content holds just 2 people.
Soon will be the ability to support multi-language (but this service will be paid as a separate branch support).
Because the client Classics are only in Russian and Korean version, we use the Russian version of the patch (respectively the test server you will be less clear), that would not be crit error when you start the game (add Russian language itself in the OS).