Multi language support in SRLauncher

[MinecraftSRDEV]

I've just released the first build for version 0.16, which introduces the ability to display the UI in multiple languages. Texts are loaded as langpack files and can be freely translated into multiple languages, and there can be many of them.

Setting texts this way can be more error-prone and significantly complicate the code in the long run, but on the other hand, the launcher is more flexible.

For now, I'm planning to implement it experimentally in 0.16 and see how it goes. Do you think this data loading system is worth further development?