That depends on a number of things
1.Which language is your player set to ... most german blu rays will pick that
up and display the menu in the language of the player
2.Some manufacturers , Universum , Concorde , Ems , Tobis , dont do this and everything is in german including the writing of the special features ...these movies also automatically default to the german soundtrack and you have select the english language track.
3.Certain studios Universal , Paramount ect.. give you a language selection upon insertion of the disc ...
4.if the disc is FSK 18 there wont be an English language menu .. but still and english language track...
This information is from my own personal experience .. so maybe there is more to it out there .
hope it was helpful.

