Review zhtw translation again!

- Use Chinese parens in required version.
- Review ch1 (zhtw).
- Review ch2 (zhtw).
- Review ch3 (zhtw).
- Review ch4 (zhtw).
- Review ch5 + add license to noun.
- Review ch6 (zhtw).
- Review ch7 (zhtw).
- Review ch8 (zhtw).
- Review ch9 (zhtw).
- Review ch10 (zhtw).
- Review ch11 (zhtw).

Ref. #65