How can the contributors notice the changes in English version?

How can the contributors notice the changes in English version,
so that the contributors can change the corresponding translations?

[Other references]

• reactjs.org
  • The repo of the English version of the website: https://github.com/reactjs/reactjs.org
  • The repo of the Korean version of the website: https://github.com/reactjs/ko.reactjs.org
  • There is a bot that
    • Every Monday,
    • This bot detects the changes in Eng repo,
    • and open a PR to Korean repo that suggests corresponding changes. (Example)
• kubernetes.io
  • All the languages (en, ko, ...) are managed in one repo: https://github.com/kubernetes/website
  • English-version-updating commits are merged to master.
  • Every two weeks, the l10n teams of each language (e.g. Korean) create a new dev branch from master, like
    • dev-1.20-ko.6 (Created on 2021-03-05 from master)
    • dev-1.20-ko.7 (Created on 2021-03-20 from master)
  • Since dev-1.20-ko.6 branch contains the Eng version of website source as of 2021-03-05,
  • and dev-1.20-ko.7 branch contains the Eng version of website source as of 2021-03-20,
  • comparing dev-1.20-ko.6 and dev-1.20-ko.7 shows the changes in English version.
    • (The script that helps comparing: https://github.com/kubernetes/website/tree/master/scripts#diff_l10n_branchespy)
  • Also, there is a script that checks if the English version of some localized contents have changed since a localized version has been committed.

Start by comparing the referenced reactjs.org localization bot and Kubernetes website workflows, including diff_l10n_branches.py and lsync.sh. Define a workflow that lets contributors identify English changes and update corresponding translations; completion should include an agreed implementation or documented process for this repository.