About: Synchronize 4.9 tagline across about pages for credits, freedoms, and privacy.

Props dave.pullig.
Amends [41943].
See #42087.
Fixes #42518 for trunk.

Built from https://develop.svn.wordpress.org/trunk@42157


git-svn-id: https://core.svn.wordpress.org/trunk@41988 1a063a9b-81f0-0310-95a4-ce76da25c4cd