Fix a issue where the translation name isn't showing up in the Background Update emails, caused by a PHP Warning/missing variable in [25806]. See #18200

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Twenty Fourteen: implement tag auto-complete for featured content settings, and uppercase `__CLASS__` for consistency. Props kovshenin, see #25549.
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Twenty Fourteen: cleanup, props iamtakashi. Fixes #25613.

 * With the ephemera widget in place, `content-recent-formatted-post.php` is unused, see #25028.
* We're no longe filtering formatted posts from the main query, see #25330.
 * Fix a typo.
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Merge the should_auto_update() and can_auto_update() methods. see #22704.

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Update the banner for update-core.php that tells users they are set up for security updates to happen in the background.

"This site is set up to install security updates of WordPress automatically. Cool!"

Checkmark is a placeholder; we'll tinker with this further today.

see #22704.

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When a plugin enables Background Plugin	updates, don't deactivate the plugin during update as we require a browser to reactivate it afterwards. See #22704

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Allow the WordPress.org Language update API to disallow automated background updates for a specific language pack. See #18200

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Inline documentation for hooks in wp-admin/edit-form-advanced.php.

Props ericlewis.
Fixes #25434.

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"Future security updates will be applied automatically." see #22704.

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Inline documentation for hooks in wp-admin/custom-header.php.

Props gizburdt for the initial patch.
Fixes #25443.

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