So I've used form alter to add in a site information variable (which auto-saves because it's a system_settings_form), but I can't seem to get it to show up as multilingual.

Here is my form alter to add the field:

 * Implements hook_form_FORM_ID_alter().
function omm_form_system_site_information_settings_alter ( &$form, &$form_state ) {
    // Add field in Site Information area of admin configuration.
    $form['site_information']['site_pretitle'] = array(
        '#type' => 'textfield',
        '#title' => t('Site Pre-Title'),
        '#description' => t('This will appear above the website name on all pages.'),
        '#default_value' => variable_get('site_pretitle', ''),
        '#weight' => '0',

Edit: I've solved this already, but need 8 hours to post the solution because I'm new.


So I managed to solve this after searching through Drupal's code and the Variable module. Turns out if you add a call to hook_variable_info, it will add it into the multilingual variables list, and then if you check that off, it makes it translatable like the rest of the Site Information.

 * Implements hook_variable_info().
function omm_variable_info($options) {
  // Site configuration, site information
  $variables['site_pretitle'] = array(
    'type' => 'text',
    'title' => t('Site Pre-Title', array(), $options),
    'default' => '',
    'description' => t("This will appear above the website name on all pages.", array(), $options),
    'group' => 'site_information',

  return $variables;

After adding this, go to admin/config/regional/i18n/variable and click on the Site information group. Click the checkmark beside your variable (site_pretitle for mine), and hit Save configuration. Once that's done, return to the Site Information area (admin/config/system/site-information) and you should see it appear and say This is a multilingual variable. in bold.

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