[6.x] Fix the custom "create entry" button in card view

[JayGeorge]

This closes #12588 by hooking the handle up to create entry button in the new collection card view.

To try this:

• Switch the language to Spanish in /cp/preferences/edit
• Add 'pages_collection_create_entry' => 'Crear XY', to /resources/lang/es/messages.php
• Visit /cp/collections and see the button above the Pages card now says Crear XY

---

Note

Use server-provided create_label for the collections grid button and switch label translation keys to statamic::messages, including taxonomy term labels.

• CP UI (collections grid)
  • resources/js/components/collections/Listing.vue: create-entry-button now uses collection.create_label instead of hardcoded __('Create Entry').
• Backend
  • src/Http/Controllers/CP/Collections/CollectionsController.php: Exposes create_label in collections payload via $collection->createLabel().
  • src/Entries/Collection::createLabel() and src/Taxonomies/Taxonomy::createLabel():
    • Update translation keys to statamic::messages.{handle}_collection_create_entry and statamic::messages.{handle}_taxonomy_create_term.
• Tests
  • tests/Feature/Collections/ViewCollectionListingTest.php: Expect create_label in collections response.

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