Patterns: Rename edit label to Edit Block Pattern to resolve edge case in Chrome

[andrewserong]

What?

Backport from core: WordPress/wordpress-develop#4826 — rename the Pattern post type's edit_item label to be Edit Block Pattern.

Why?

This resolves an issue in Chrome where the browser thinks that the page is in German and displays a translation popup. As mentioned in the linked PR, the reason Chrome does this isn't quite clear, but it's possibly related to there not being very much English text in the server-rendered view of the page (Chrome ignores the document's lang attribute and does what it wants). In manual testing, adding another English word to the edit item label resolves it for now.

How?

Update Edit Pattern to Edit Block Pattern for the Pattern post type.

Testing Instructions

1. Go to /wp-admin/edit.php?post_type=wp_block to view the list of patterns.
2. If you don't already have any patterns, add one, and then go back to that list.
3. Click to edit one of the patterns. Before this PR, Chrome will display a popup to translate from German to English.
4. With this PR applied, there should be no popup displayed.

When testing, go from the wp-admin page and click the edit link on the pattern to test whether or not the translation popup is displayed.

Screenshots or screencast

Before	After

[github-actions]

Flaky tests detected in 5467e3a.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/5516674812
📝 Reported issues:

• [Flaky Test] Block context is reflected in the preview #48826 in specs/editor/plugins/block-context.test.js

[tellthemachines]

Thanks for following up with this!