Help tabs: Update plugin install and media help text to reflect 4.0.

see #28654.

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About page, at last.

All strings are available for translation. We anticipate few, if any, changes before release. Images and video will be moved to w.org soon.

props ryelle, melchoyce, nacin, MarkJaquith, helen, DrewAPicture, kpdesign.
fixes #29243.

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git-svn-id: http://core.svn.wordpress.org/trunk@29417 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Refresh the post-update login message.

Just a little older in the soul, like your faithful release lead.

fixes #29388.

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git-svn-id: http://core.svn.wordpress.org/trunk@29418 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media library: Ensure the header area is spaced consistently between view modes.

see #28946.

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git-svn-id: http://core.svn.wordpress.org/trunk@29419 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Help tabs: Update media help text to reflect 4.0.

fixes #28654.

Built from https://develop.svn.wordpress.org/trunk@29646


git-svn-id: http://core.svn.wordpress.org/trunk@29420 1a063a9b-81f0-0310-95a4-ce76da25c4cd
4.0-RC1.

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git-svn-id: http://core.svn.wordpress.org/trunk@29421 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Correct a Sass typo that somehow slipped by in [29616].

see #28267.

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git-svn-id: http://core.svn.wordpress.org/trunk@29422 1a063a9b-81f0-0310-95a4-ce76da25c4cd
TinyMCE wpView: fix 'undefined' head when not adding more stylesheets to the sandbox iframe, fixes #29399
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Meta Query: Revert [28659] (and [28665]) due to regressions.

props boonebgorges.
fixes #29285. see #25538.

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git-svn-id: http://core.svn.wordpress.org/trunk@29424 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix typo in media help text.

props tai.
fixes #29412.
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Sync tagline from about page with credits and freedoms.

props rickalee.
fixes #29409.

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