Fix frontend to include languages that do not have iso-639-1 codes

[zackkrida]

Description

As discovered by a contributor in this issue, our translations of the Saraiki language were not appearing in production. I realized that the language was being filtered out of our valid translations because it does not have a langCodeIso_639_1 property in our code. This is because the language is part of the https://en.wikipedia.org/wiki/ISO_639-3 standard, which is essentially v3 of the list of international language codes, and our code was only including languages present in v1.

Saraiki appears to be the only language impacted by this change

Testing Instructions

just frontend/run i18n and just frontend/run dev locally and observe that the /skr path now works. You could also count and confirm that the locale chooser now has 61 languages instead of the 60 in production, with running something like [...document.querySelectorAll('.language option')].length in your browser's console.

Checklist

• My pull request has a descriptive title (not a vague title likeUpdate index.md).
• My pull request targets the default branch of the repository (main) or a parent feature branch.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.
• I ran the DAG documentation generator (just catalog/generate-docs for catalog
  PRs) or the media properties generator (just catalog/generate-docs media-props
  for the catalog or just api/generate-docs for the API) where applicable.

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[AetherUnbound]

LGTM! Just noting that I had to run just frontend/run i18n locally first in order to get it to run before /skr showed up for me.

[obulat]

Great find! Interesting that only one language with a translator community is affected by this change :)