How to change the wording of the password input screen

change_passwordform.php

function my_password_form() {
    return '<p>ここが説明文</p>
<form class="post_password" action="' . home_url() . '/wp-login.php?action=postpass" method="post">
パスワード <input name="post_password" type="password" size="24" /> <input type="submit" name="Submit" value="' . esc_attr__("ボタン") . '" />
</form>';
}
add_filter('the_password_form', 'my_password_form');