Quick pass on all translations.

* Some markup fixes and unify.
* Fix punctuations.
* Remove unnecessary things.
* Use https when possible

Ref: #65 
在 [line 60](https://github.com/jlord/git-it/pull/96/files#diff-c4839336dad408f82c0bf300ae6c2bc6R56) 到 [line 63](https://github.com/jlord/git-it/pull/96/files#diff-c4839336dad408f82c0bf300ae6c2bc6L63) 已經有 git verify 跟前往下一關的段落，而且在 [line 79](https://github.com/jlord/git-it/pull/96/files#diff-c4839336dad408f82c0bf300ae6c2bc6L79) 已經有提醒除錯完可以再執行一次 git-it verify，如果真的要讓這段再出現一次，可以考慮 [line 79](https://github.com/jlord/git-it/pull/96/files#diff-c4839336dad408f82c0bf300ae6c2bc6L79) 跟這段兩者擇一，或是把這段的內容取代 [line 79](https://github.com/jlord/git-it/pull/96/files#diff-c4839336dad408f82c0bf300ae6c2bc6L79)