Add MCE views for audio and video shortcodes. When the shortcode does not contain a source that supports native playback, just show the filename.

* Remove the audio/video shortcode parsing from the `wpgallery` plugin.
* Make `mce-view` a dependency of `media-audiovideo`
* Introduce `wp.mce.video`, `wp.mce.audio`, `wp.mce.media`, and `wp.mce.media.View`
* Rename `wp.media.audio|video.shortcode()` to `wp.media.audio|video.update()` since it is called on Update and returns a `wp.shortcode` object now.
* In `wp.mce.View.render()`, fire a `ready` event when the placeholder is being parsed and pass the current node to the event handler.

See #27389, #27437.


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git-svn-id: http://core.svn.wordpress.org/trunk@27458 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Bump the version for TinyMCE's stylesheet.

See [27615].


Built from https://develop.svn.wordpress.org/trunk@27616


git-svn-id: http://core.svn.wordpress.org/trunk@27459 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In `sanitize_file_name()`, replace a UTF-8-encoded Unicode representation of a non-breaking space (`\u00a0` / `\xc2\xa`) with an old-fashioned space: ` `.

Fixes #27281.


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TinyMCE strings: Merge, remove, reorganize, restore, clarify.

see #27453, #24067.

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git-svn-id: http://core.svn.wordpress.org/trunk@27461 1a063a9b-81f0-0310-95a4-ce76da25c4cd
JSHint fix for [27608].

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git-svn-id: http://core.svn.wordpress.org/trunk@27462 1a063a9b-81f0-0310-95a4-ce76da25c4cd
More translation cleanups.

Affects widgets (see #27112), custom headers (see #21785), theme installer (see #27055, reverts [27614]), and some media stuff. Untranslates some complicated strings that need additional study.

see #27453.

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