I18n

void Init(const std::string& directory = "");
void SetLanguage(const std::string& code);
std::string GetCurrentLanguage();
std::vector<LanguageInfo> GetAvailableLanguages();
const char* T(const char* key);       // 翻译
const char* Translate(const char* key);

XBase/i18n/
  zh/index.json    { "name": "简体中文", "files": ["zh.json"] }
  zh/zh.json       { "menu.player": "玩家", "menu.vehicle": "载具", ... }
  en/index.json    { "name": "English", "files": ["en.json"] }
  en/en.json       { "menu.player": "Player", ... }