Librarian Bot: Add language metadata for dataset (#2)

Update data/ja.csv

Update data/en.csv

Update data/en.csv

Update data/en.csv

Update data/en.csv

Update data/en.csv

Update data/ja.csv

Update data/ja.csv

Update data/ja.csv

Update data/en.csv

Update data/en.csv

Update data/en.csv

Update data/ja.csv

Create ja.csv

Update data/en.csv

Create data/en.csv

Update README.md

initial commit