Jetpack: Publicize: Open Graph Tags:

Enhanced Open Graph: standardize on always favoring featured images over other media extraction.
 * This appears to be the behaovior most users expect, and it wasn't the case for galleries only.
 * Refactored repeated code in a new helper function in the same file: enhanced_og_has_featured_image().
 * All changes are Jepack compatible.

Also, correct a backwards usage of sprintf inside of a __() translation function.



git-svn-id: https://plugins.svn.wordpress.org/jetpack/trunk@813786 b8457f37-d9ea-0310-8a92-e5e31aec5664