Twenty Fifteen: make sure the 'says:' in comments is readable by a screen-reader.

Fixes #30479.


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Twenty Fifteen: update the .pot file.

Props iamtakashi, fixes #30433.


Built from https://develop.svn.wordpress.org/trunk@30571


git-svn-id: http://core.svn.wordpress.org/trunk@30561 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fifteen: docs correction.

Props rachelbaker, DrewAPicture, fixes #30456


Built from https://develop.svn.wordpress.org/trunk@30572


git-svn-id: http://core.svn.wordpress.org/trunk@30562 1a063a9b-81f0-0310-95a4-ce76da25c4cd