Update docs about compile_mo.sh on Windows

This is now required for the unit tests, whereas the libintl bug is no
longer relevant since we have rolled our own solution.

doc/COMPILING/COMPILING-VS-VCPKG.md

@@ -54,7 +54,7 @@ This will configure Visual Studio to compile the release version, with support f
 
 5. If you need localization support, execute the bash script `lang/compile_mo.sh` inside Git Bash GUI just like on a UNIX-like system. This will compile the language files that were not automatically compiled in step 2 above.
 
-Even if you do not need languages other than English, you may still want to execute `lang/compile_mo.sh en` or `lang/compile_mo.sh all` to compile the language file for English, in order to work-around a [libintl bug](https://savannah.gnu.org/bugs/index.php?58006) that is causing significant slow-down on Windows targets if a language file is not found.
+Even if you do not need languages other than English, you may still want to execute `lang/compile_mo.sh` to compile the language files if you're planning to run the unit tests, since those rely on the language files existing.
 
 ### Debugging