I guess cmake needs to copy the scripts to the build folder?

Some background, for those who are interested: when I started the CMake branch, the idea was to have the current-working-directory in bin, so these files didn't have to be copied and constantly checked for: "are you modified?". lang is loaded from where-ever openttd is located (inside the build folder), which on the targets I was testing worked fine.

Sadly ... it turns out initially my set of targets I tested with was too limited :) On Windows it is pretty common that``openttd.exelives inbuild/Debug` and `build/Release`, meaning it cannot find `lang` (which is in `build/lang`). As such, the current-working-directory has to be your build-folder for it to work. So this whole idea had to be thrown out of the window, and the content of `bin` has to be copied inside the `build` folder.

I am guessing, but I have not checked the code, that this last part never happened yet. I think I never left that as comment in the PR how I left it, and in normal testing this won't show up ... but who is to blame for not implementing this is not important now, is it? :D

So yeah, sounds like the best solution is to copy the files from the bin folder inside the build folder via CMake :) Just be careful that changes to those file have to trigger a new copy .. but by now we have enough experience with that, not? (and with "we" I guess I mean @glx22 .. sorry :P)

FYI: There is a patch for that in JGRPP: JGRennison/OpenTTD-patches@e39a1d2. :)