1.copy json5 file to src\assets\i18n
zh-CN.json5.txt
zh-TW.json5.txt
2.edit file
src\config\default-app-config.ts
languages: LangConfig[] add

{ code: 'zh-CN', label: '简体中文', active: true },
{ code: 'zh-TW', label: '繁体中文', active: true },
。