Re-add tags page text

[obulat]

Fixes

Fast-follow to #4291

Description

#4442 that added the tags page copy text was merged into #4291, but when I used the GitHub UI to rebase the branch onto main before merging it, the merged PR changes disappeared. This PR re-adds the changes from #4442.

Setting the priority to high because this affects the strings sent to translators. We can deploy prod again after this PR is merged to speed up the translator strings updates.

Testing Instructions

Run the app using just frontend/run dev (or just frontend/run i18n:en and just frontend/run dev:only if you don't want to download all locales)
Go to http://localhost:8443/search?q=cat and select the second image result.
There should be a "generated tags" section. Click on "Learn more" next to the heading. It should contain correct text (the prod currently has a very short sentence originally used as a stub)

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 (./ov just catalog/generate-docs for catalog
  PRs) or the media properties generator (./ov just catalog/generate-docs media-props
  for the catalog or ./ov just api/generate-docs for the API) where applicable.

Developer Certificate of Origin

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[AetherUnbound]

Verified that the tags page is accessible as expected and that the new text renders!

[sarayourfriend]

@obulat heads up that these comments will not appear in the generated pot file, only comments on the string properties themselves do. I have a small patch I was working on that might fix this though, because it would be nice if this just worked!

Update: I've created an issue for this #4565