Revise description, examples for Pull Requests
Merge pull request #56 from jordanmccullough/pull-request-pull-tuning

Revise description, examples for Pull Requests
Update Ja translation to d40af7d
Corresponding translation for Pull Request #56
Merge pull request #57 from hail2u/ja-translation

Update Ja translation to d40af7d
Merge pull request #58 from tonyxue/master

Corresponding translation for Pull Request #56
Translate Checking out Pull Requests (ko)
Small style fix
Merge pull request #59 from marocchino/ko-translation

Translate Checking out Pull Requests (ko)
Updated Task List section to show Nested Task List
Merge pull request #61 from AlexandreArpin/master

Updated Task List section to show Nested Task List
Update task list translations(ko, ja, zh-cn)
Merge pull request #62 from marocchino/update-translation

Update task list translations(ko, ja, zh-cn)
Fix the URL for checking out a PR to FETCH_HEAD

I'm pretty sure this example if missing `/head` on the end, because when
I do this it fails:

```
$ git fetch origin refs/pull/70
fatal: Couldn't find remote ref refs/pull/70
fatal: The remote end hung up unexpectedly
```

Whereas when I do this it works:

```
$ git fetch origin refs/pull/70/head
From github.internal:organisation/example-repo
 * branch            refs/pull/70/head -> FETCH_HEAD
```
Merge pull request #63 from samjsharpe/master

Fix the URL for checking out a PR to FETCH_HEAD
Use issue in Japanese, too. Rarely seen イシュー
Pull request is more popular than プルリクエスト
Correct some words
Merge pull request #64 from mttrs/jp-correction

Jp correction
add translation for #50