How to create a variable in Opencart2?

Question

opencart

In controller/error/not_found.php I
added a new variable to display other text in the template, there is no way to display the desired text!

$data['button_shopping'] = $this->language->get('button_shopping');

renamed in the template
<?php echo $button_shopping; ?>
What could be the problem?

Answer 1

Perhaps $this->language->get('button_shopping')empty?
Well, or turn on the display of errors ... In the open map there was even a section of the admin panel where you can see the logs, maybe there will be a record if something went wrong ..

Answer 2

Options:
1) -You do not have this variable in the language file
2) -You have a cache. Clear cache and test

Answer 3

Have you looked at the cache? vqmod including? maybe something is cached from the server side as well.