Update zh-rTW translation.

    <!-- Pro version -->

    <string name="upgrade_to_pro_long">此版本的應用程式已不再維護。請升級到專業版。</string>

    <string name="it_is_free">它在此日期前免費：%s. If you download it till then, you will be able to use it for free forever.</string>

    <string name="it_is_free">它在此日期前免費：%s。如果您在這個日期前下載它的話，您就可以永久免費使用它。</string>

    <string name="more_info">更多資訊</string>

    <string name="upgrade">升級</string>