Drupal 7 button creation instead of input='submit'
Drupal 7 doesn't allow us to override the theme_button(&$variables) function even if you use hook_theme_registry_alter(). A kinda ugly method was found but doesn't fall to far from standards.
$form['buttons']['continue'] = array(
'#type' => 'submit',
'#value' => '',
'#attributes' => array('style' => array('display: none')),
'#validate' => array('commerce_checkout_form_validate'),
'#submit' => array('commerce_checkout_form_submit'),
'#prefix' => '<button type="submit" class="btn btn-primary">Next',
'#suffix' => '</button>',
);
Source: https://drupal.stackexchange.com/questions/13796/generating-button-type-submit-with-the-form-api
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