TinyMCE: update to 4.0.28+. Includes all changes until 09-06-2014: https://github.com/tinymce/tinymce/tree/32cb108d41b27265c60a8bc1f62855fdfb61e486. Changelog: https://github.com/tinymce/tinymce/blob/32cb108d41b27265c60a8bc1f62855fdfb61e486/changelog.txt.
See #28391.
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