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< +  if (!isset($form['#language_configation_submit_added'])) {
---
> +  if (!isset($form['#language_configuration_submit_added'])) {
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< +    $form['#language_configation_submit_added'] = TRUE;
---
> +    $form['#language_configuration_submit_added'] = TRUE;
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< + * Returns that root name of the variables used to store the configuration.
---
> + * Returns the root name of the variables used to store the configuration.