Add localization support

[DCNick3]

We already can play fully translated SNRs like umineko-catbox-english, but it would be nice to have a more seamless experience.

This would probably involve:

• implementing support for western layout rules
• implementing support for loading translated strings, both for SNR and UI in form of TXAs and embedded strings (when we'll get them(
• implementing switching between languages (preferably live in-game, like in PC Nekopara localizations)