Create Italian auth.php

File was missing.
Translated.

resources/lang/it/auth.php

@@ -0,0 +1,15 @@
+<?php
+return [
+    /*
+    |--------------------------------------------------------------------------
+    | Authentication Language Lines
+    |--------------------------------------------------------------------------
+    |
+    | The following language lines are used during authentication for various
+    | messages that we need to display to the user. You are free to modify
+    | these language lines according to your application's requirements.
+    |
+    */
+    'failed' => 'Le credenziali non sono valide.',
+    'throttle' => 'Troppi tentativi di accesso. Riprovare in :seconds secondi.',
+];