Code Quality: Unwrap `sprintf()` with one argument.

This removes unnecessary uses of the `sprintf()` function when localizing or outputting static strings. These changes simplify the code and improve readability without affecting functionality.

Props Soean.
See #64898.

git-svn-id: https://develop.svn.wordpress.org/trunk@62167 602fd350-edb4-49c9-b593-d223f7449a82