Updated TinyMCE to 4.0.17 (including translations and bundled plugins/skins/themes)

Updated TinyMCE to version 4.0.17 (released 2014-02-26).

Translations are updated to the latest version provided from the TinyMCE webpage as of today.
Bundled plugins, skins and themes are also updated to the version provided by the 4.0.17 release.

This update fixes, among a lot of other things, issues with paste/copy/cut in Safari 7.x on Mac OS X.