Is it possible to customize the OK button text ???

Hello all,
I got a button that run a short code for making a sound alert like this

$myAudioFile = “…/_lib/img/alarm_001.wav”;
echo ‘<EMBED SRC="’.$myAudioFile.’" HIDDEN=“TRUE” AUTOSTART=“TRUE”></EMBED>’;

I need to customize the “OK” button text for instance with " TO STOP ALARM CLICK HERE ".
Is it possible and how ?
Thanks

aaa.jpg