TinyMCE:
- Fix PressThis styling when the popup is resized.
- Don't force loading of the media JS.
- Add the 'image' plugin as fallback when no media button(s).
- Add back the link icon tooltip/menu item string for translation.
See #24067, see #24409


git-svn-id: https://develop.svn.wordpress.org/trunk@27660 602fd350-edb4-49c9-b593-d223f7449a82