Hello, I don't know why this doesn't work for you Yeyo53, but I figure that in an OSX 10.etc... the way to find HOSPITAL.CFG is a little more complicated !
Here the way:
In "Theme Hospital.app" (the shortcut you use to start the game), choose "Show Package Contents". Then, navigate to:
Contents/Resources/game
Here, you find another "Theme Hospital. app" and you have to do the same as the begining :
choose "Show Package Contents", then, navigate to:
Contents/Resources
Find the "Theme Hospital.boxer" and choose "Show Package Contents" again. Here, navigate to:
C.harddisk
And you will find the famous "HOSPITAL.CFG" !
You can open it with "Textedit" to do the language modification Slanzinger talked about ! ^^
Hope this will help some people !