Index: stringoverrides.admin.inc
===================================================================
--- stringoverrides.admin.inc	(revision 300)
+++ stringoverrides.admin.inc	(working copy)
@@ -26,6 +26,13 @@ function stringoverrides_admin() {
     $form['string'][$delta] = stringoverrides_textbox_combo($delta);
     $delta++;
   }
+  $form['language'] = array(
+    '#type' => 'textfield',
+    '#title' => t('Language code'),
+    '#description' => t('The language code that appears in the <a href="@dirlang">language information and text direction</a> for the HTML document. Note that this cannot be "en", but something else. "en-US" is appropriate, but feel free to change it.', array('@dirlang' => 'http://www.w3.org/TR/1999/REC-html401-19991224/struct/dirlang.html#langcodes')),
+    '#default_value' => variable_get('stringoverrides_language', 'en-US'),
+    '#required' => TRUE,
+  );
 
   $form['save'] = array(
     '#type' => 'submit',
@@ -50,6 +57,9 @@ function stringoverrides_admin_submit($f
   // Save into the English language definition
   variable_set('locale_custom_strings_en', $words);
 
+  // Save the language name
+  variable_set('stringoverrides_language', $form_values['language']);
+
   // Output a message to the user
   drupal_set_message('Your changes have been saved.');
 }
Index: stringoverrides.module
===================================================================
--- stringoverrides.module	(revision 300)
+++ stringoverrides.module	(working copy)
@@ -102,9 +102,10 @@ function stringoverrides_enable() {
  */
 if (!function_exists('locale')) {
   function locale_supported_languages($reset = FALSE, $getall = FALSE) {
+    $language = variable_get('stringoverrides_language', 'en-US');
     return array(
-      'name' => array('xx' => 'String Overrides'),
-      'formula' => array('xx' => ''),
+      'name' => array($language => 'String Overrides'),
+      'formula' => array($language => ''),
     );
   }