* Revert "Add a new `lib-i18n` to make message translation easier (#16942)"
This reverts commit 4e17c228cad1e789ca74ad592924d8bed6d925ea.
* Bump the versions.
* Add support to better internationalization with a new lib.
* Add info about `lib-i18n` in the contributing guide.
* Use lib-i18n in M+ as well.
* Change properties files to UTF-8.
* Add language support (#845).
* Add update to tell the user to migrate.
* Renames source to distinguish between the old and new one.
* Fix missing uppercase 'Shueisha' in appName.
* Remove deprecated on old extension appName.
