How is this any different, other than the translation aspect, than having lyrics? Lyrics components already exist for Foobar2000. I'm guessing you're talking about the foobar2000 desktop version here and not mobile since these boards are for the desktop version only.You shouldn't compare a video player like VLC to an audio player.
I don't have access to a Windows system right now (I use Linux on the desktop) so I don't know if the lyrics extensions would work.
The captions are essentially lyrics - but with time indications, as an SRT file - e.g.100:00:02,500 --> 00:00:04.750This is a line of text that would display from 2.5 seconds through 4.75 seconds of the audio.
Sorry to hear plugins for the android version can't be made available, I guess Android users with hearing impairment will just need to either use VLC or not have the aid of captions.