PolymetisOutis

Wtf Solidity japanese 101 Lesson 15 (Last Lesson)

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### What type of PR is this (这是什么类型的PR) - [ ] Typo(勘误) - [ ] BUG(程序错误) - [x] Improvement(提升) - [x] Feature(新特性) ### Which issue(s) this PR fixes(Optional) (这个PR 修复了什么问题...

WTF Solidity Japanese mainly 101 Lesson 12 to 14

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### What type of PR is this (这是什么类型的PR) - [ ] Typo(勘误) - [ ] BUG(程序错误) - [x] Improvement(提升) - [x] Feature(新特性) ### Which issue(s) this PR fixes(Optional) (这个PR 修复了什么问题...