[tex-live] program translation po updates

[Jjgod Jiang]

Hi Karl,

On Fri, Sep 18, 2009 at 7:59 AM, Karl Berry <karl at freefriends.org> wrote:
> For those who have worked on the translation strings for tlmgr, it seems
> that {it,zh.cn,zh.tw,sl}.po are not up to date.  Please update anything
> possible.

Since the original translator of zh-cn.po is not responsive right now, I
decided to update this myself. I will let you know when I finish.

- Jiang