There seem to be no major differences between P2P release and the genuine English version other than the anti piracy measures used (original uses TAGES and P2P release uses Starforce which is bypassed). There is no 3rd party translating involved as the original language files are used. A closer look suggests that it is actually the Russian version with the English Language files being imported from the EU version of the game. There is a Clear Sky release floating around in P2P networks which seems to be a playable English version. However it seems that the StarForce protection that comes with Russian release can be bypassed.
It has not been cracked by the scene so far. TAGES is also a tough nut to crack and even Clone DVD versions usually require the pro version of Daemon Tools to properly emulate TAGES protection.Latest DT Pro does not seem to have the ability to emulate TAGES version that comes with Clear Sky. Most StarForce games are not fully cracked but there are many workarounds that simply allow users to bypass the protection. Both these anti piracy measure are considered hard to crack.
The Russian version had StarForce copy protection system embedded and the EU version had TAGES + SolidShield protection. The EU (English Language) version was released on the 5th of September.
: Clear Sky (Russian Language) was released in Russia on the 22nd of August. But is there a playable English release? Yes. So has the English version been fully cracked? Not really.