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.
git-svn-id: https://develop.svn.wordpress.org/trunk@34628 602fd350-edb4-49c9-b593-d223f7449a82