Karaoke-style movie generation chinese support

[zhou20120904]

I tried to use Karaoke-style movie generation on my Chinese audio, then I got this:

https://github.com/ggerganov/whisper.cpp/assets/125183026/b713a84a-86d6-4935-aeb0-76fe9142856a

Full of 口s. So, can you add some Chinese fonts into the feature?

[zhou20120904]

the plain text output was: [00:00:00.600 --> 00:00:05.800] 他的名字则来自十五朝岭乡上掉落的三个字 [00:00:05.800 --> 00:00:06.320] 母。