zh_TW.po: fix typo

Simply 轉備 -> 準備

Signed-off-by: Ｖ字龍(Vdragon) <Vdragon.Taiwan@gmail.com>
zh_TW.po: improve translation

Signed-off-by: Ｖ字龍(Vdragon) <Vdragon.Taiwan@gmail.com>
zh_TW.po: update PO-Revision-Date

Signed-off-by: Ｖ字龍(Vdragon) <Vdragon.Taiwan@gmail.com>
Merge pull request #325 from Vdragon/zh_TW_translation

i18n: zh_TW translation updates

Signed-off-by: David Aguilar <davvid@gmail.com>