Install sage9 language files?

[strarsis]

Related discussion:

Localization of Blade templates

The pot build command created a new directory ./resources/lang/ with sage.pot inside. I downloaded language files from the https://github.com/roots/sage-translations repository and placed it in same ./resources/lang/ folder. However, the sage9 related strings are still not translated. Edit: Also saved a new translation using the generated sage.pot as template, but the resulting .po isn’t used by the site either.