Twenty Fifteen: add spaces after screen reader text strings to make them readable. Props nvwd, pavelevap, afercia. Fixes #30606.
Built from https://develop.svn.wordpress.org/trunk@30781


git-svn-id: http://core.svn.wordpress.org/trunk@30771 1a063a9b-81f0-0310-95a4-ce76da25c4cd