For what it's worth, I'm pretty sure you can set the language to English even in the localized version, if the translation sucks too badly. You'd still have to deal with the "low-violence" mode though:
All in all it could probably be worse; those changes don't really affect the integrity of the game too badly.The German version of The Orange Box is set to a low violence mode in order to comply with German laws regulating the sale of violent video games. Blood effects are replaced by sparks and bullet wounds are replaced with dents as if the characters were metal robots. [...] In the Half-Life games, bodies fade away after the death of non-player characters and the blood has been altered to a gray color.