How do i change the button text "subscribe", from the "simplenews" module, in drupal 8?

Question

I'm very new to drupal and programming.

I simply want to change some text on the simplenews "subscribe"/"unsubscribe" buttons.

From past questions I understand the only solution is programmatically? I've seen the hook_page_alter() method mentioned but I am not experienced enough to get it to work.

This is my poor attempt at utilizing it:

 function MYTHEME_form_alter(&$form, &$form_state, $form_id) {
  if ($form_id == 'simplenews_subscriptions_block') {
       $form['New button text'] = array(
           '#markup' => '<p> New button text </p>',
       )    
    } 
}

Answer 1

I figured it out due to 4k4's comment

Basically you can translate it english-to-english under /admin/config/people/simplenews/settings/subscriber/fields/ It's a part of the configuration translation module.

If you get the error message "The configuration objects have different language codes so they cannot be translated:" look at this thread for the solution for that: How to change default language for configuration entities