LangID is a LANGID and LayoutID is a KLID: keyboard layout ID.
See terminology at http://archives.miloush.net/michkap/archive/2004/11/27/270931.html
These tables of MUI_LAYOUTS for each language, correspond to the
intl.inf LCID map:
```
; List of locales.
; <LCID> = <Description>,<OEMCP>,<Language Group>,<langID:HKL pair>,<langID:HKL pair>,...
```
where:
- each MUI_LANGUAGE entry corresponds to one such locale description;
- each MUI_LAYOUTS entry corresponds to a <langID:HKL pair>.
See http://archives.miloush.net/michkap/archive/2006/10/14/825404.html
for some details.
