Jetpack: Don't attempt to display the video thumbnail if one is not available yet for preview.


git-svn-id: https://plugins.svn.wordpress.org/jetpack/trunk@774715 b8457f37-d9ea-0310-8a92-e5e31aec5664
Jetpack: Translation functions should only have straight strings passed in. Add 'jetpack' textdomain.


git-svn-id: https://plugins.svn.wordpress.org/jetpack/trunk@774716 b8457f37-d9ea-0310-8a92-e5e31aec5664