Source

File: wp-includes/post-formats.php

function _post_format_get_terms( $terms, $taxonomies, $args ) {
	if ( in_array( 'post_format', (array) $taxonomies, true ) ) {
		if ( isset( $args['fields'] ) && 'names' === $args['fields'] ) {
			foreach ( $terms as $order => $name ) {
				$terms[ $order ] = get_post_format_string( str_replace( 'post-format-', '', $name ) );
			}
		} else {
			foreach ( (array) $terms as $order => $term ) {
				if ( isset( $term->taxonomy ) && 'post_format' === $term->taxonomy ) {
					$terms[ $order ]->name = get_post_format_string( str_replace( 'post-format-', '', $term->slug ) );
				}
			}
		}
	}
	return $terms;
}