How to insert a new audio stream in an existing DVD?

Hi all,

I need to translate to my language the original audio stream (in english) of a public speach recorded in a DVD. The DVD has no subtitles.

I would like to insert this new audio stream in the DVD.

What softwares shall I use to record the new audio stream and to create a new DVD with the original material and the new audio stream? Is it possible to replace the original audio stream with my translation?

Thanks for your help.