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).

docs/manual/02-installing.md

@@ -1,7 +1,7 @@
 # Installing LlamaMod and the first start
 
 LlamaMod runs on **Windows** and **Linux**. It needs your own copy of the game – the CD or an ISO
-image of it. The game itself does not have to be installed: LlamaMod copies what it needs into
+image of it, German or English version. The game itself does not have to be installed: LlamaMod copies what it needs into
 its own data folder and never changes the original.
 
 ## Download and start

docs/manual/20-troubleshooting.md

@@ -102,9 +102,12 @@ after an update, **Settings → Clear cache** throws it away; active mods are re
 
 ## FAQ
 
-**Do I need the German version of the game?**
-The tools were developed with the German CD. Other language versions use the same engine and
-should work; if one does not, please report it.
+**Which versions of the game work?**
+The German CD (`groove.exe` of 2001-02-12) and the English first release (2000-10-17) are
+supported, including every mod. With another version the level mods still work, but the mods
+marked *modifies groove.exe* stop with "unknown program version" – the first lines of
+`logs/apply.log` name the version LlamaMod found. Please report it together with that
+`groove.exe`, then it can be added.
 
 **Can I share levels with people who do not have the game?**
 No – levels are built from the receiver's own game copy. That is also what makes sharing legal: