feat(books): rename Locate button to Check WorldCat and use Check Options for search/carousels

[Sadashii]

This PR renames the "Locate" button to "Check WorldCat" on the book/edition page, and changes the label to "Check Options" (pointing back to the book/work page) in search results, carousels, and the editions table when a specific edition is unavailable.

Technical

• Renamed the LocateButton.html macro to CheckWorldcat.html and changed user-facing string labels to Check WorldCat.
• Created conditional logic inside LoanStatus.html:
  • edition_page=True (passed from the edition/work view template) renders the CheckWorldcat button.
  • When is_edition is True but it is not on the book page itself (e.g., search results, carousels, editions list), it renders a Check Options button linking to the work page ($work_key).
• Retained the CTAClick|Locate telemetry event action for click analytics to avoid breaking historical dashboards.

Testing

1. Run python template tests:
   uv run --with-requirements requirements_test.txt pytest openlibrary/tests/test_templates.py
2. Run standard lint checks:
   npm run lint

Screenshot

Stakeholders

@mekarpeles

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

This PR updates Open Library’s “read/locate” CTAs to use a WorldCat-oriented flow and adjusts LoanStatus behavior based on page context.

Changes:

• Update LoanStatus call sites and signature to use edition_page context.
• Replace “Locate” UI with “Check WorldCat” / “Check Options” CTAs in read-related macros.
• Add new i18n strings for the updated CTA text.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
openlibrary/templates/books/edition-sort.html	Updates LoanStatus invocation, removing the prior page-context flag.
openlibrary/macros/databarWork.html	Passes new edition_page argument into LoanStatus.
openlibrary/macros/ReadButton.html	Switches locate action to CheckWorldcat.
openlibrary/macros/LocateButton.html	Renames displayed CTA copy to “Check WorldCat”.
openlibrary/macros/LoanStatus.html	Changes macro signature and rewrites unavailable-state CTA logic.
openlibrary/i18n/messages.pot	Adds i18n strings for new CTA labels and help text.