This is looking good to me! One question about using Un as the prefix instead of null but everything else is looking good.

Since the link works with a redirect in it's current state, I was leaning that this could be a patch fix, however, thinking about how widespread the typo could be we'll definitely want to flag it and that might necessitate a minor version.

Clicking through some showcase links, I was able to find a few identifiers whose identifiers didn't have the An and were displaying correctly, so maybe the issue isn't as widespread and we might worry.

Testing checklist

• Confirm the HTML in the html-templates directory renders as expected
  • Check that the component preview and component code on the demo identifier page display with the updated information
  • In this branch, run npm run build:html and confirm the HTML in the affected identifier files have the correct information
• Confirm that the Storybook build renders as expected
• Confirm there are no references to "Visite USA.gov en Español" or "https://www.usa.gov/espanol/" in uswds

LGTM!

Minor comment, but not a blocker — just a suggestion.

Also, the breaking change section in PR description could use some clarity.

This is not a breaking change.
This is a markup change.

This means that there are two changes total and one is minor (template prefix) and the other breaking (markup) — correct?

Important
This might need to be bumped to 3.9.0 because this involves markup changes. We could also explore splitting this into two different PRs - one to fix the erroneous "An" in the component preview in 3.8.1 and one for the intentional text updates in 3.9.0.

Splitting it into two makes sense to me. Especially if we want to follow semver. Any preference @thisisdano?

Thanks for splitting up the PR. Helps a lot with testing.

Confirming the output Spanish HTML is no longer getting the English prefix.

<!-- On `npm run build:html` →
- <span aria-hidden="true">An </span>Un sitio web oficial de
+ Un sitio web oficial de