Request to add subtitle line break feature

[Superhuh]

I am using bilingual subtitles to learn a language, so the subtitles should have an upper and lower line, but now they are all displayed in one line, and the layout is terrible.

[gignupg]

Thanks for reporting this! I've also noticed this recently but haven't had the time to fix it. Feel free to do a PR, I'll gladly accept it!