Events deletion: ask confirm

refs #5

larigira/dbadmin/templates/add_time_kind.html

@@ -41,8 +41,9 @@ webshim.polyfill('forms-ext');
 <div class="container-fluid">
 		<div class="alert alert-danger">
 			<form method="POST"
+						onsubmit="return confirm('Are you sure you want to delete?');"
 						action="{{ url_for ('db.delete_alarm', alarmid=alarmid) }}" >
-			<button class="btn btn-danger">Cancella</button>
+			<input type="submit" value="Cancella" class="btn btn-danger" />
 			</form>
 		</div>
 	</div>