Replace !$user_ID with !is_user_logged_in(). props garyc40. see #15508.
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Improve inline comment for removing default padding styles for the Toolbar.

Props nofearinc.
Fixes #25373.

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Improve inline documentation for wp-trackback.php.

Props kpdesign.
Fixes #25377.

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Inline documentation for hooks in wp-includes/l10n.php.

Props Nao.
Fixes #25382.

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Add a language pack upgrader class.

At the conclusion of any upgrade, after the transients are refreshed from the API, pending translations are downloaded and installed to wp-content/languages.

props dd32.
see #18200.

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Inline documentation improvements for wp-includes/comment-template.php.

Changes include:
- Existing phpdoc block improvements
- Inclusion of defaults for optional parameters
- Hash-notated argument arrays
- Removal of unnecessary or redundant tagging.

Also standardization of int|WP_Post function parameters.

These changes clear the way toward less redundancy for hook docs in a future ticket.

Still left: Fully documented arguments in `comment_form()` and a pass through Walker_Comment.

See #20495. See #25388.

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Language Packs: Integrate Language Packs into the Auto-upgrader. See #18200 See #22704

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