Correct punctuations and spelling errors

As title, fixed several spelling errors probably caused by translators' IME. They are mostly pronounced the same, but with different meanings. (e.g. 已: has been / 以: in order to; they both pronounced yǐ.) Another correction is related to punctuation, which use CJK full-width ellipsis (⋯⋯) instead of periods.

By the way, Nelisquare is really impressive and smooth for daily use. Thanks Basil and all the contributors in this project!