Final about page text.

props siobhan, kerikae, DH-Shredder, nacin.
see #27713.

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Fix typo on about page.

props helen.
see #27713.

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Allow the API to add text to auto update emails.

fixes #27812.

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3.9-RC2

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Fix entities on about page. see #27713.

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Background Updates: Avoid a PHP warning during theme update checks when there are multiple theme directories registered. Fixes #27815

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