* Add Bangla translation for README.md

* Added README_bn.md for Bangla translation

* improve Belarusian translation from machine-generated to human-readable

* use more consistent vocabulary

Go wiki has moved https://github.com/golang/go/issues/61940. Wiki at
github.com/golang/go/wiki does not automatically move to go.dev/wiki
but says that wiki has moved.

I used the following shell one-liner to convert all links:

    $ find . -type f -print0 | xargs -0 sed -i 's,github.com/golang/go/wiki,go.dev/wiki,g'

To verify if they return 200:

    $ ag -a --nofilename -o 'https?.+wiki/.+?\b' | sort | uniq | xargs curl -sI
    HTTP/2 200
    (...)
    HTTP/2 200

That repo's master branch was renamed to main.

Application in the Foreign Language Notation Examples in the website of
the National Institute of the Korean Language is assessed as '애플리케이션.

https://iceruler.tistory.com/16#:~:text=%EA%B5%AD%EB%A6%BD%EA%B5%AD%EC%96%B4%EC%9B%90%20%EB%88%84%EB%A6%AC%EC%A7%91%20%EC%9E%90%EB%A3%8C%EC%8B%A4%EC%9D%98,%EC%A2%85%ED%95%A9%EC%83%81%EB%8B%B4%EC%9D%98%20%EB%8B%B5%EB%B3%80%EB%82%B4%EC%9A%A9).&text=%EC%A6%89%2C%20'%EC%95%B1'%EC%9D%80%20',%ED%8B%80%EB%A6%B0%20%ED%91%9C%EA%B8%B0)%EC%9D%98%20%EC%A4%80%EB%A7%90%EC%9E%85%EB%8B%88%EB%8B%A4.