Include translations in the update bubbles (as +1 if there are any). see #18200.

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Avoid a few PHP Warnings when files don't exist and use a better method to locate the local filepath.
See #18201

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Fix a issue where the translation name isn't showing up in the Background Update emails, caused by a PHP Warning/missing variable in [25806]. See #18200

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Twenty Fourteen: implement tag auto-complete for featured content settings, and uppercase `__CLASS__` for consistency. Props kovshenin, see #25549.
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Twenty Fourteen: cleanup, props iamtakashi. Fixes #25613.

 * With the ephemera widget in place, `content-recent-formatted-post.php` is unused, see #25028.
* We're no longe filtering formatted posts from the main query, see #25330.
 * Fix a typo.
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