General comments for this `keypad.js` file, as you can see in the top comment, at some point it was (should have) kept in sync with `apps/system/emergency-call/js/keypad.js`.

The truth is those file diverged a long time ago, and I don't think you should try to backport your changes to the system file.

That said we should remove the comment in both files since we're not keeping them in sync anymore.