optimized & Chinese README

[NKID00]

• clickable touch bar button, not only the text behind it
• detailed time limit, not "too long"
• when move over a checkbox, cursor is shown as a pointer
• add README in Simplified/Traditional Chinese

[NKID00]

突然发现 locales/README.md 的第49和81行少了俩句号…

[RoderickQiu]

Good of it, thanks.