Translator's comment for a date_i18n() string.

props netweb.
fixes #26470.

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Update the help text on themes.php. The Install Themes tab is now an Add New button.

props ethitter.
fixes #26285.

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Use non-breaking spaces before the last word in headlines to prevent widows when wrapping at responsive sizes. See #26387.
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Twenty Fourteen: clean up PHP braces style in page templates. Closes #26467.
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