使用plugin\\u区域设置筛选器：

apply_filters( \'plugin_locale\', $locale, $domain );

$my_plugin_domain = \'my_plugin_domain_name\';
$override_locale = \'es-ES\';
add_filter(\'plugin_locale\',
    function ($locale, $domain) use ($my_plugin_domain, $override_locale) {
        if($domain == $my_plugin_domain) {
            $locale =  $override_locale;
        }
        return $locale;
    }, 10, 2);