Untitled

function custom_translate_text_for_logged_out_users( $translated_text, $text, $domain ) {
    if ( !is_user_logged_in() && $domain === 'woocommerce' && $text === 'Temporarily unavailable' ) {
        $translated_text = 'Login to see details';
    }
    return $translated_text;
}
add_filter( 'gettext', 'custom_translate_text_for_logged_out_users', 10, 3 );