When passing a value of 'slug' to `wp_insert_term()` that contains non-ASCII
characters, WordPress converts accented characters to non-accented versions.
(See `sanitize_title()` and `remove_accents()`.) The same conversion happens
when fetching when fetching a term using a slug. In this way, it's possible to
create a term and fetch it using the same accented string, even though the slug
is actually stored with non-accented characters.
See #16282.
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