Prevent large images in comments from overflowing the meta box.

props mattheu.
fixes #26643.

git-svn-id: https://develop.svn.wordpress.org/trunk@27252 602fd350-edb4-49c9-b593-d223f7449a82
Force UTF-8 in load-styles.php, like we do in load-scripts.php.

props iamfriendly, mjbanks.
fixes #25012.

git-svn-id: https://develop.svn.wordpress.org/trunk@27253 602fd350-edb4-49c9-b593-d223f7449a82