This changeset replaces contracted verb forms like `doesn't`, `can't`, or `isn't` with non-contracted forms like `does not`, `cannot`, or `is not`, for better consistency across the WordPress administration. It also updates some corresponding unit tests strings.
Props Presskopp, socalchristina, aandrewdixon, francina, SergeyBiryukov, JeffPaul, audrasjb, hellofromTonya.
Fixes#38913.
See #39176.
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