Added new screen shot to show Widget Feature!

git-svn-id: https://plugins.svn.wordpress.org/random-youtube-video/trunk@925964 b8457f37-d9ea-0310-8a92-e5e31aec5664
Added new screen shot to show Widget Feature and fixed Installation language file. 

git-svn-id: https://plugins.svn.wordpress.org/random-youtube-video/trunk@925966 b8457f37-d9ea-0310-8a92-e5e31aec5664