Index: devel_generate.inc
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/devel/Attic/devel_generate.inc,v
retrieving revision 1.14.2.19
diff -u -5 -p -r1.14.2.19 devel_generate.inc
--- devel_generate.inc	3 Feb 2010 18:29:45 -0000	1.14.2.19
+++ devel_generate.inc	31 Mar 2010 22:26:23 -0000
@@ -490,10 +490,15 @@ function devel_generate_nodeapi(&$node, 
         }
 
         if ($results['add_terms']) {
           devel_generate_add_terms($node);
         }
+        if ($results['add_language']) {
+          $languages = array_keys(language_list());
+          $languages[] = ''; // Content can be langage neutral too.
+          $node->language = $languages[array_rand($languages)];
+        }
         break;
     case 'insert':
       if ($results['max_comments']) {
         devel_generate_add_comments($node, $results['users'], $results['max_comments'], $results['title_length']);
       }
Index: devel_generate.module
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/devel/Attic/devel_generate.module,v
retrieving revision 1.11.2.14
diff -u -5 -p -r1.11.2.14 devel_generate.module
--- devel_generate.module	24 Sep 2009 15:57:44 -0000	1.11.2.14
+++ devel_generate.module	31 Mar 2010 22:26:23 -0000
@@ -161,10 +161,16 @@ function devel_generate_content_form() {
     '#type' => 'checkbox',
     '#title' => t('Generate node view statistics (node_counter table).'),
     '#default_value' => TRUE,
     '#access' => module_exists('statistics'),
   );
+  $form['add_language'] = array(
+    '#type' => 'checkbox',
+    '#title' => t('Set language on nodes.'),
+    '#default_value' => TRUE,
+    '#access' => module_exists('locale'),
+  );
   $form['submit'] = array(
     '#type' => 'submit',
     '#value' => t('Do it!'),
   );
   $form['#redirect'] = FALSE;