Default Themes: Bump the version numbers and release dates.

Update the theme versions and release dates for the default themes, in time for WordPress 5.0.2.

The POT files for Twenty Ten and Twenty Eleven have also been updated.

Fixes #45681.


Built from https://develop.svn.wordpress.org/trunk@44322


git-svn-id: https://core.svn.wordpress.org/trunk@44152 1a063a9b-81f0-0310-95a4-ce76da25c4cd