In `wptexturize()` + tests:
* Allow well-formed HTML inside of shortcode attributes
* Restrict recursion. HTML is allowed but ignored.
* Do not allow exotic HTML comments in shortcode attributes.
* Continue to ignore the [ and ] chars if they appear in any HTML attribute.
* Update related regex patterns.
* Update unit tests.

Props miqrogroove.
Fixes #28564.

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git-svn-id: http://core.svn.wordpress.org/trunk@28586 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Allow a language to be chosen before installing WordPress. First pass. 

* Checks WordPress.org for available languages.
* In get_locale(), starts using the WPLANG option that has existed in multisite since the MU days.
* Adds new argument to wp_install() for setting WPLANG.

see #28577. 

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git-svn-id: http://core.svn.wordpress.org/trunk@28587 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Diambiguate `type` and `shortcode` in TinyMCE view classes and their attached `view.View` class. Has the added feature of not causing JS errors.

See #28532.

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git-svn-id: http://core.svn.wordpress.org/trunk@28588 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Move preg_match() that should only run once out of the loop.

props dllh.
fixes #28575.
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git-svn-id: http://core.svn.wordpress.org/trunk@28589 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix copy/paste error in a comment.

see #28581.
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Restore the ability to pass classes to admin menu submenu items, important for the Customize link. Accidentally left out in [24048]. fixes #28583.

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git-svn-id: http://core.svn.wordpress.org/trunk@28591 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix variable usage in new language install choices. see #28577.

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git-svn-id: http://core.svn.wordpress.org/trunk@28592 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Narrower screen when choosing a language. see #28577.

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