[Core] 🌍 Builtin plugin i18n support

[BakaFT]

Thanks to 冷泡茶OuO@Discord for zh_TW translations

[nomi-san]

I'll make a simpler i18n and support custom command actions for locale specific via JSON.

{
  "fallback": "en-US",
  "translations": {
    "_locales": [
      "en-US"
    ],
    "general": {
      "active": "Pengu Loader is active!"
    },
    "actions": [
      {
        "name": "Home",
        "perform": "https://pengu.lol"
      },
      {
        "name": "Create ARAM",
        "perform": "$create.aram"
      }
    ]
  }
}