Filter chapter languages specific to each title, not just global.

[N0Mi0]

For some titles, sometimes a scanlation group in another language (Russian, in my case) would be farther ahead in the series. Thing is, it's tedious to check Russian chapters display each time. And since I can't just leave it checked, for it would spam the whole site with Russian chapters, I need to turn it off.

Would've been great if I could just mark "Manga A: show chapter languages: EN and RU", instead of changing it globally.