可以在配置里写上

$config = [
    'id' => 'basic',
    'basePath' => dirname(__DIR__),
    'bootstrap' => ['log'],
    'language'=>'zh-CN',
    'sourceLanguage'=>'zh-CN',
    'timezone'=>'Asia/Shanghai',
    'charset' => 'utf-8',
    ...，
];

进行i18n国际化