[2.2.0-RC2.2] Static content deploy with multiple locales: js-translation.json files are the same

[hostep]

Preconditions

1. PHP 7.0.22

Steps to reproduce

1. Install Magento 2.2.0-rc22 using composer
2. Add 2 language packs using composer: composer require honl/magento2-nl-nl imaginaerum/magento2-language-fr-fr
3. Create 2 different storeviews in the backend and set the Locale configuration to Dutch (Netherlands) and French (France) for those 2 storeviews
4. Run php bin/magento setup:static-content:deploy -f -t Magento/luma nl_NL && php bin/magento setup:static-content:deploy -f -t Magento/luma fr_FR
5. Run diff -rwq pub/static/frontend/Magento/luma/nl_NL/ pub/static/frontend/Magento/luma/fr_FR/
6. Results: Files pub/static/frontend/Magento/luma/nl_NL/js-translation.json and pub/static/frontend/Magento/luma/fr_FR/js-translation.json differ => Good
7. Remove all generated static files: rm -R pub/static/* var/view_preprocessed/*
8. Run php bin/magento setup:static-content:deploy -f -t Magento/luma nl_NL fr_FR
9. Run diff -rwq pub/static/frontend/Magento/luma/nl_NL/ pub/static/frontend/Magento/luma/fr_FR/
10. Results: ... nothing, all files are equal => Not good

Expected result

1. When generating static content using multiple locales in one go, the generated js-translation.json files should be different

Actual result

1. When generating static content using multiple locales in one go, the generated js-translation.json files are the same
   This has as result that all javascript translations are in the wrong locale on the frontend.

Discussion

This is the same issue like I reported on #7862 for Magento 2.1.3, but this was supposed to be fixed by MAGETWO-62660, which is included in Magento 2.2.0-RC2.2, but looks like that didn't really help, or something else might broke it yet again ...

[misha-kotov]

Thanks for reporting - internal issue is MAGETWO-72301