How to change “Read More” text?

by 

add_filter('gettext', 'translate_my_text' );
function translate_my_text($translated) { 
$translated = str_ireplace('Leave a comment on: “%s”', 'my text“%s”', $translated);
$translated = str_ireplace('Leave a Comment', 'my text', $translated);
$translated = str_ireplace('Read More', 'my text', $translated);
$translated = str_ireplace('READ MORE', 'my text', $translated);
return $translated; 
}