Translate `library/re.po`

[ascodeasice]

library/re.po有244個需要翻譯的字串，maintainer覺得拆成多份PR（例如一次大約100行改動）可以嗎?

• [x] 簡介
• [ ] Regular Expression Syntax
  • [ ] 到 {m,n}?
  • [ ] 到 (?aiLmsux-imsx:...)
  • [ ] 到 (?(id/name)yes-pattern|no-pattern)
  • [ ] 到模組內容
• [ ] Flags
• [ ] Functions
• [ ] Exceptions
• [ ] Regular Expression Objects
• [ ] Match Objects
• [ ] Regular Expression Examples