[ja] Improve translation of chapter 9
[ja] Correct a description of .git/info in chapter 9
[ja] Fix a typo in chapter 9
[ru] Update chapter 1

Fix some punctuation problems.
Merge pull request #438 from rc5hack/master

[ru] Update chapter 1
Merge pull request #436 from uasi/ja-chapter9

[ja] Improve chapter 9