HelenOS sources

L18N_WIN_LOCALE_CZECH   48 uspace/lib/c/include/l18n/langs.h 	L18N_WIN_LOCALE_CZECH = 0x0405,
L18N_WIN_LOCALE_CZECH   48 uspace/lib/posix/include/libc/l18n/langs.h 	L18N_WIN_LOCALE_CZECH = 0x0405,
HelenOS homepage, sources at GitHub