Add steps to quickstart guide for setting CONTENT_TRANSLATED_ROOT

In the Yari quickstart guide, an example along with explanation for creating the environment variable CONTENT_ROOT is clear. But, I don’t see anywhere that mentions we must define a CONTENT_TRANSLATED_ROOT env var. It would be nice to have a small explanation (eg its mdn/content but the translated files in mdn/translated-content) along with an example.

Do you have CONTENT_TRANSLATED_ROOT set? Is that repo up to date?

As I was recently informed of this myself from @peterbe and .env.dist , we must define CONTENT_TRANSLATED_ROOT=path/to/translated-content/files. If this env variable is not defined, the following error is thrown for some pages when serving locally with yarn dev. It expects the CONTENT_TRANSLATED_ROOT env variable to be defined.

Loading Error
Error: 500 on /en-US/docs/Web/CSS/flex/index.json: Error: 'ar' not in de,en-US,es,fr,ja,ko,pl,pt-BR,ru,zh-CN,zh-TW

[peterbe]

Since some pages do indeed need the mdn/translated-content directory of files, then I reckon having CONTENT_TRANSLATED_ROOT be required to set would make sense.

This here seems like the bug to focus on 😃 Thanks for finding that!

[escattone]

Thanks for creating this @tannerdolby!