Makes the calendar respect new slug names

Filter for new slug names.php

/**
 * @param  string $url
 * @param  string $type
 * @return string
 */
function modify_month_list_link_urls( $url, $type ) {
	if ( 'month' === $type ) return str_replace( 'month', 'calendar', $url );
	if ( 'list'  === $type ) return str_replace( 'list', 'all-events', $url );
	if ( 'photo' === $type ) return str_replace( 'photo', 'picture-board', $url );
	return $url;
}

/**
 * Change specific event view slugs when we link to them via the view selector
 * and other places.
 */
add_filter( 'tribe_events_getLink', 'modify_month_list_link_urls', 20, 2 );