Final text adjustments to the 3.8 About page. Also:
 * Offload screenshots to WP.org, as we had done in 3.6.
 * Offer strings for translation.
 
props markjaquith, nacin.
fixes #26387.

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Eliminate the padding on #titlediv #title to prevent characters with descenders getting cropped in some browsers. Fixes #26509, props SergeyBiryukov.


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Twenty Fourteen: fix breakpoint at 782 pixels wide to exactly match WordPress toolbar breakpoint. Props jjj, fixes #26501.
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Introduce dashboard_glance_items filter which replaces 3.7 right_now_* hooks that were tied to table markup.

fixes #26495.

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Add line height to #commentstatusdiv p so that its checkboxes get some padding between them at responsive sizes. Fixes #26499, props SergeyBiryukov.


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Style the Add Comment button as a button. Fixes #26500, props SergeyBiryukov.


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Increase the height of the Add Photos box in Press This to prevent unnecessary scrolling. Fixes #26506, props SergeyBiryukov.


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In Press This, extend the sidebar for ru_RU. Fixes #26508, props SergeyBiryukov.


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Slightly darkening the page backcground to f1f1f1 for better contrast with white interface elements on top of it. See #25858.
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Themes: fix overlays and buttons in responsive mode, props matveb, fixes #26481.
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Themes: set maximum width for overlay view, props matveb, fixes #26507.
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Adjust the border-color and box-shadow on container elements to match the new f1f1f1 background-color. See #25858, props melchoyce.
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Return container shadows to 1px blur as they were pre- r26293. This is a better match for the 1px shadow we use on buttons and screen options. See #25858.
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Twenty Fourteen: remove extra space before a word, props ocean90. See #26437.

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Twenty Fourteen: match `screen-reader-text` accessibility styles a bit better with core, to avoid a jump when you move through the links, and to avoid a horizontal scroll at certain viewport widths. Also fix JS focus by specifying the first match object. Closes #25592.
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3.8-RC2

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Merge remote-tracking branch 'upstream/master'