About page RTL fixes.

Merges [30951] and [30952] to the 4.1 branch.

props helen, alex-ye.
fixes #30743, #30748.

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Twenty Fifteen: Final RTL, editor-style, and search padding fixes.

Merges [30953], [30955], [30956] to the 4.1 branch.

Props iamtakashi, alex-ye.
fixes #30744, #30739, #30746.

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Update individual term caches in `get_terms()`.

Merges [30954] to the 4.1 branch.

props boonebgorges.
fixes #30749. see #21760.

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