The hook occurs in the following file:
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/**
* Filters the language codes.
*
* @since MU (3.0.0)
*
* @param string[] $lang_codes Array of key/value pairs of language codes where key is the short version.
* @param string $code A two-letter designation of the language.
*/
$lang_codes = apply_filters( 'lang_codes', $lang_codes, $code );
return strtr( $code, $lang_codes );
}
/**
* Synchronize category and post tag slugs when global terms are enabled.
*
* @since 3.0.0
*
* @param object $term The term.
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