Fix logic inversion in [28124] to ensure widgets stay with themes during a theme switch.

Merges [28161] to the 3.9 branch.

props gcorne.
fixes #27897.

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Theme Installer: Proper redirection and action links post-install in multisite.

Merges [28163] to the 3.9 branch.

fixes #27869.

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Version and POT file updates for bundled themes Twenty Eleven through Twenty Fourteen.

Merges [28165] and [28166] to the 3.9 branch.

props lancewillett.
fixes #27843.

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