Combine two strings, using placeholders for filenames and avoiding HTML. see #27057.

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Remove HTML from a new string. see #26709.

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Twenty Twelve: improve menu navigation for keyboard and voice-over interactions by properly focusing on submenu items when they are open. See #24839, props dannydehaan, joedolson, lancewillett.
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Twenty Thirteen: improve menu navigation for keyboard and voice-over interactions by properly focusing on submenu items when they are open. Closes #24839, props dannydehaan, joedolson, lancewillett, Frank Klein.
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Create a new file, `media-audiovideo.js`, to house all of the audio and video JS code in core.

UX Changes:
* Don't add a menu item for "Add Audio|Video Source"
* In the Audio|Video Details modal, add buttons and some suggestive text for adding alternate playback sources
* Don't show "Create Audio|Video Playlist" menu items until the user has uploaded audio or video files

See #27437.


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Context for theme install strings. Untranslate an error message until it can be cleaned up.

see #27453, #27055.

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Improve the autosave error message on nonce failure.

see #27453, #25272.

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Remove two new strings from post_preview().

see #25272, #27453.

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Skipping placeholders in a string will only catch translators off guard.

see #27453, #27132.

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Use an ellipsis instead of ...

see #27453, #27055.

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