Update task.md

Author: Veljko Pejović

1-js/02-first-steps/01-hello-world/2-hello-alert-ext/task.md

@@ -1,9 +1,9 @@
-importance: 5
+važnost: 5
 
 ---
 
-# Show an alert with an external script
+# Prikaži upozorenje sa spoljnom skriptom
 
-Take the solution of the previous task <info:task/hello-alert>. Modify it by extracting the script content into an external file `alert.js`, residing in the same folder.
+Rešite prethodni zadatak <info:task/hello-alert>. Izmijenite ga iznešavanjem sadržaja skripte u spoljnu datoteku `alert.js`, koja se nalazi u istom folderu.
 
-Open the page, ensure that the alert works.
+Otvorite stranicu i osigurajte da upozorenje radi.