Missing "other language" subs

I’ve been ripping my DVDs using DVDFab 6, then encoding them using AutoGK.
It’s all working quite nicely, but I’m missing the subtitles where characters drift into other languages - Kill Bill for example, where she’s in Japan.
How do I prevent this happening in the future, and is there any way I can quickly fix this without having to rip and encode them all over again? (I’d prefer hard subbed rather than a separate file if possible.