[mpvnet] support for the English language

[SatL1Ng]

Could you please add support for the English language. I like your modification, but I don't understand Chinese. Thanks

能否请你增加英语语言支持。我喜欢你的修改，但我不懂中文。谢谢你

[hooke007]

There is no multi-language framework in mpvnet. Supporting other language is painful.
Considering that upstream would not maintain his project (mpvnet-player/mpv.net#527), my fork will stop updating too.