Manual: translate material table into chinese

[MongooseSong]

Translate "material table" into chinese.

That's a very little change, but I also update the table css style because the vertical title text make the table crammed. I am not sure why using "writing-mode: vertical-lr" so I just remove it.

[Mugen87]

I've tested your new CSS. The table looks better on my desktop but on mobile devices the headings have ugly line breaks. The existing styles work better in this regard.

TBH, I suggest you do not change styles in translation related PRs. Do this separately otherwise it might delay a merge considerably.

[MongooseSong]

I've tested your new CSS. The table looks better on my desktop but on mobile devices the headings have ugly line breaks. The existing styles work better in this regard.

TBH, I suggest you do not change styles in translation related PRs. Do this separately otherwise it might delay a merge considerably.

Thanks for review, I had already removed the relative code. maybe next time I will try to fix it by media query or another way, thanks for your advice 😃