add translation for #50
fix the link in table of contents
Merge pull request #66 from tonyxue/master

add translation for #50
Fix typo.
Merge pull request #67 from sangheestyle/master

Fix typo.
Rendering and diffing images
Merge pull request #68 from hariadi/rendering-images

Rendering and diffing images
Update Ja translation to 27773ac
Merge pull request #69 from hail2u/ja-translation

Update Ja translation to 27773ac