Rosetta sites are missing JSON localization

[fierevere]

Since WP 5.0 parts of localization (JS) for some WP parts (block editor) are provided as set of .json files.

It seems that all Rosetta sites are missing them and therefore Block editor is only localized partially.

This affects all, main locale site (LOCALE.wordpress.org), support site /support and P2 /team

[fierevere]

example of editor for nl_NL

[vladytimy]

It also affects Make sites.

[ocean90]

In 11141:

Translate: Add --projects argument to export command for limiting the projects to export.

See #5829.

[ocean90]

Since [dotorg17580] the language updater is now using the same exporter which is used for language packs and has support for JavaScript translations.