docs: refresh English and Japanese README for globalization

Assisted-by: Claude (AWS Bedrock anthropic.claude-3-haiku-20240307-v1:0)
Assisted-by: GitHub Copilot (GPT-5.3-Codex)

Author: amilkh

README.ja.md

@@ -1,6 +1,6 @@
 # gBizINFO
 
-日本の企業情報に関するデータを視覚化および提供するプロジェクトです。
+日本の企業情報に関するデータを可視化および提供するプロジェクトです。
 
 ## デモ
 

README.md

@@ -22,14 +22,10 @@ The project provides CSV files containing the following datasets:
 - Company trademarks and patents by city
 - Creation and termination of companies by prefecture and month
 
-## Usage
-
-The datasets can be accessed and used by downloading the CSV files from the project's GitHub repository.
-
 ## Data Sources
 
 The data used in this project is provided by the [gBizINFO](https://info.gbiz.go.jp/) service operated by the Ministry of Economy, Trade and Industry (METI) of Japan.
 
 ## License
 
-The data and code in this project are available under open source licenses. Please refer to the individual licenses for each component.
+MIT License — see [LICENSE](LICENSE).