Use short form array syntax everywhere

- Add short form array syntax to po2php.php generation

mod/fetch.php

@@ -11,7 +11,7 @@ use Friendica\Util\XML;
 function fetch_init(App $a)
 {
 
-	if (($a->argc != 3) || (!in_array($a->argv[1], array("post", "status_message", "reshare")))) {
+	if (($a->argc != 3) || (!in_array($a->argv[1], ["post", "status_message", "reshare"]))) {
 		header($_SERVER["SERVER_PROTOCOL"].' 404 '.t('Not Found'));
 		killme();
 	}