Add a feature pointer for widgets in the customizer in 3.9. Remove older pointers from 3.3 and 3.4.

see #27777.

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Add an explanation for 'Paste from Word' in the 'Paste from Text' dialog.

fixes #27777. see #27160.

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Translate another About string and use _e(). see #27713.

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The widgets pointer requires the edit_theme_options capability.

(It's hypothetically possible to have only switch_themes.)

see #27777.

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