remove duplicate
fix links
Merge pull request #72 from EngForDev/translation

#20 Add japanese, Fix some unnatural korean expressions and typo
Merge pull request #73 from EngForDev/translation

#20 add japanese
Merge pull request #74 from EngForDev/translation

#20 apply @jksy s review
Merge pull request #71 from artemeff/fix

Remove duplicate from russian version and fix links