Merge Twenty Fifteen commits [30801-30806], [30808-30811] to the 4.1 branch.

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TinyMCE, image toolbar: remove the animation and make the box-shadow lighter.

Merges [30812] to the 4.1 branch.

props melchoyce.
fixes #30664.

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Fix the search field width in the media modal, media library grid and on the install new plugins screen.

Merges [30813] to the 4.1 branch.

props helen.
fixes #30658.

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Editor focus: Don't trigger when typing while the mouse is outside the editor.

Merges [30817] to the 4.1 branch.

props avryl.
fixes #20668.

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Allow the `type` argument to be passed through `get_the_pagination()` as long as its value isn't `array`.

See #29808

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About page text, first pass.

Merges [30821] to the 4.1 branch.

props johnbillion, helen, markjaquith, nacin.
see #30435.

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Rename `(get_)the_pagination()` to `(get_)the_posts_pagination()` for clarity.

Merges [30823] to the 4.1 branch

See #29808
Props obenland

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Switch to `(get_)the_posts_pagination()` in Twenty Fifteen.

Merges [30824] to the 4.1 branch.

See #29808
Props obenland

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4.1 RC1

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