Add Chinese encoding(zh-Hans/zh-Hant)

TAO ZUHONG requested to merge taozuhong/libadwaita:main into main

This MR is a technical MR, it implements one thing:

  1. Add language encoding(zh-Hans/zh-Hant)
  2. Add initial po file for them.

Then the Chinese translation team could do translation for them.

Fixes glib#2610 (closed) and Teams/Translation/zh_CN#41

Edited by TAO ZUHONG

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