<issue_start><issue_comment>Title: Translate "Custom Cache" page into Japanese
username_0: ## Overview

- translate [Custom Cache page](https://swr.vercel.app/advanced/cache) into Japanese
- Supports mutation page updates ( e1411dd847159f70a87ea72eabd5166d3b594177 )

Translator : @username_0
Proofreader : @shioyang

note: Cleaned #114.
<issue_comment>username_1: Thank you!