Favor escaping over interpolation in Underscore templates for media. Translate some strings directly instead of passing via JS.

Props nacin.
See #27574.


Built from https://develop.svn.wordpress.org/trunk@27868


git-svn-id: http://core.svn.wordpress.org/trunk@27699 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Cleanup up the display, escaping, and handling of ID3 data for media. Rename `wp_get_relevant_id3_keys()` to `wp_get_attachment_id3_keys()`.

Props nacin.
See #27574.


Built from https://develop.svn.wordpress.org/trunk@27869


git-svn-id: http://core.svn.wordpress.org/trunk@27700 1a063a9b-81f0-0310-95a4-ce76da25c4cd