Language Packs

Create jsons/lang/lang.json or .json5 in a datapack. Use text node keys from the original language table and supply the language fields you want to override.

{
  "_languages": [{ "code": "es", "name": "Español", "isCJK": false }],
  "LoadingTips": [{
    "en": "Sun is your core resource.",
    "zh": "阳光是你的核心资源。",
    "es": "El sol es tu recurso principal."
  }]
}

_languages registers additional languages: code is the language code, name is shown in game settings, and isCJK controls text-width handling. Omit it when only editing existing languages.

Objects deep-merge; arrays are replaced. The example replaces the LoadingTips list, so include other entries you want to keep. Localized names and Almanac fields can also be edited in their Features or Almanac patches.

Install and apply the pack, then change language in the game's own settings. GP-Next's panel language is separate. Export original text and keys from game data.