Change the “Don’t want these emails?”

<?php
/**
  * Change "Don't want these emails?" in footer
  *
  * @param $text string 
  * @return $text string
  * * * * * * * * * * * * * * * * * * */
function gh_change_dont_want_these_emails( $text ) {

    $text = str_ireplace( "Don't want these emails?", "Custom Message",  $text );

    return $text;
}
add_filter( 'gettext', 'gh_change_dont_want_these_emails' );