readme and docs: german and english game versions supported, what happens with other versions

docs/manual/01-introduction.md

@@ -98,7 +98,7 @@ and press **Play** to play the level – or press **F5** in the editor. See
 
 ## What you need
 
-* The PC game (CD or ISO image; developed with the German version).
+* The PC game (CD or ISO image): the German or the English version (see [FAQ](20-troubleshooting.md#faq)).
 * LlamaMod – see [Installing LlamaMod](02-installing.md).
 * A graphics card with **OpenGL 3.3** for the editor's 3D view.
 * On Linux, Wine to run the game (LlamaMod sets it up).