Add classes to form containers on taxonomy screens.

props jarednova.
fixes #28196.
Built from https://develop.svn.wordpress.org/trunk@29803


git-svn-id: http://core.svn.wordpress.org/trunk@29570 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add classes to form containers on Edit User screen.

props jarednova.
fixes #29348.
Built from https://develop.svn.wordpress.org/trunk@29804


git-svn-id: http://core.svn.wordpress.org/trunk@29571 1a063a9b-81f0-0310-95a4-ce76da25c4cd