tool validate-redirects de fails with CONTENT_TRANSLATED_ROOT pointing to translated-content-de

[caugner]

What information was incorrect, unhelpful, or incomplete?

% yarn content validate-redirects de
yarn run v1.22.22
$ yarn -s info:rari && env-cmd --silent cross-env CONTENT_ROOT=files rari-tool validate-redirects de

🐥 This command is now using rari: https://github.com/mdn/rari
🐞 Please report any issues here:  https://github.com/mdn/rari/issues/new?template=bug.yml

Error: io error: No such file or directory (os error 2) (/Users/claas/github/mdn/translated-content-de/files/es/_redirects.txt)

Caused by:
    No such file or directory (os error 2)
error Command failed with exit code 1.

See also: https://github.com/mdn/translated-content-de/actions/runs/13179001293/job/36784943688#step:7:1

What did you expect to see?

It should ignore locales other than the one provided as an argument.

Do you have any supporting links, references, or citations?

Similar to #107.

Do you have anything more you want to share?

No response