clear_all_data warning

scripts/system_controls.php

@@ -7,12 +7,12 @@
     <button type="submit" name="submit" value="sudo reboot" onclick="return confirm('Are you sure you want to reboot?')">Reboot</button>
   </form>
   <form action="" method="POST">
-    <button type="submit" name="submit" value="update_birdnet.sh">Update</button>
+    <button type="submit" name="submit" value="update_birdnet.sh" onclick="return confirm('Are you sure you want to update?')">Update</button>
   </form>
   <form action="" method="POST">
     <button type="submit" name="submit" value="sudo shutdown now" onclick="return confirm('Are you sure you want to shutdown?')">Shutdown</button>
   </form>
   <form action="" method="POST">
-    <button type="submit" name="submit" value="sudo clear_all_data.sh" onclick="return confirm('Clear ALL Data? This cannot be undone.')">Clear ALL data</button>
+    <button type="submit" name="submit" value="sudo clear_all_data.sh" onclick="return confirm('Clear ALL Data? Note that this cannot be undone and will take up to 90 seconds.')">Clear ALL data</button>
   </form>	
 </div>