Upgrade/Install: Remove the suggestion for users to skip a minor update to...

Upgrade/Install: Remove the suggestion for users to skip a minor update to keep their current translation.

With the introduction of asynchronous translation updates in WordPress 3.7+, the suggestion is no longer relevant.

Props casiepa, danieltj, tobifjellner, netweb.
Fixes #43242.
Built from https://develop.svn.wordpress.org/trunk@47061


git-svn-id: https://core.svn.wordpress.org/trunk@46861 1a063a9b-81f0-0310-95a4-ce76da25c4cd