Always sanitize user_nicename in wp_insert_user().

Previously, a 'user_nicename' parameter passed into the function was
unsanitized. This could result in a mismatch between the sanitized nicename
generated automatically at user creation, resulting in broken author archive
permalinks.

Props joemcgill.

Fixes #29696.
Built from https://develop.svn.wordpress.org/trunk@29819


git-svn-id: http://core.svn.wordpress.org/trunk@29585 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Use a more consistent markup on taxonomy and user screens.

props paulwilde.
fixes #29842.
Built from https://develop.svn.wordpress.org/trunk@29820


git-svn-id: http://core.svn.wordpress.org/trunk@29586 1a063a9b-81f0-0310-95a4-ce76da25c4cd
* Use correct context for 'Name' and 'Parent' strings on taxonomy screens.
* Remove unnecessary context for 'Slug' and 'Description' strings.

props andg.
fixes #29824.
Built from https://develop.svn.wordpress.org/trunk@29821


git-svn-id: http://core.svn.wordpress.org/trunk@29587 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add an aria-label attribute with commenter's name to get_comment_reply_link().

props joedolson, merty, andrewryno.
fixes #16433.
Built from https://develop.svn.wordpress.org/trunk@29822


git-svn-id: http://core.svn.wordpress.org/trunk@29588 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Make link construction in get_comment_reply_link() and get_post_reply_link() more readable.

see #16433.
Built from https://develop.svn.wordpress.org/trunk@29823


git-svn-id: http://core.svn.wordpress.org/trunk@29589 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Avoid a PHP notice in list_plugin_updates() if plugins_api() returned a WP_Error object.

fixes #29583.
Built from https://develop.svn.wordpress.org/trunk@29825


git-svn-id: http://core.svn.wordpress.org/trunk@29590 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Use correct links for filtering plugin reviews.

props OriginalEXE.
fixes #29754.
Built from https://develop.svn.wordpress.org/trunk@29826


git-svn-id: http://core.svn.wordpress.org/trunk@29591 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fourteen: Move custom description for background color and image from sections to controls in the customizer.

props jb510.
fixes #29490.
Built from https://develop.svn.wordpress.org/trunk@29827


git-svn-id: http://core.svn.wordpress.org/trunk@29592 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Switch line-height added in [29790] to a unitless value.

props janhenckens.
fixes #29451.
Built from https://develop.svn.wordpress.org/trunk@29828


git-svn-id: http://core.svn.wordpress.org/trunk@29593 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Plugin search: Wrap results in a form to fix pagination's `paged` input field.

props jesin, ocean90.
see #18724, for trunk.
Built from https://develop.svn.wordpress.org/trunk@29829


git-svn-id: http://core.svn.wordpress.org/trunk@29594 1a063a9b-81f0-0310-95a4-ce76da25c4cd