How to quickly change text on a website in WordPress?

add_filter( 'gettext', 'wpsc_my_quick_text_change', 20, 3 );
function wpsc_my_quick_text_change( $translated_text,  $untranslated_text, $domain ){	
	// Change the help text of the "Set Address on Map" button
	if(  $untranslated_text == 'Click on "Set Address on Map" and then you can also drag map marker to locate the correct address'){
		$translated_text = 'Drag the map/marker or click this button to set the address';
	}	
	return $translated_text;
}