Help/About: Revert [48811] from the 5.5 branch for now, to avoid displaying...

Help/About: Revert [48811] from the 5.5 branch for now, to avoid displaying untranslated strings on the About page.

This should be merged back when 5.5.1 is about to be released.

See #51028.
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git-svn-id: https://core.svn.wordpress.org/branches/5.5@48575 1a063a9b-81f0-0310-95a4-ce76da25c4cd