diff --git a/modules/og_notifications/og_notifications.module b/modules/og_notifications/og_notifications.module
index ab7612d..3ab97cb 100644
--- a/modules/og_notifications/og_notifications.module
+++ b/modules/og_notifications/og_notifications.module
@@ -83,7 +83,7 @@ function og_notifications_form_alter(&$form, $form_state, $form_id) {
       $nodetypes = node_get_types();
       $ogtypes = og_get_types('group_post');
       foreach ($ogtypes as $ntype) {
-        $select[$ntype] = $nodetypes[$ntype]->name;
+        $select[$ntype] = og_tt("nodetype:type:$ntype:name", $nodetypes[$ntype]->name);
       }
 
       $form['group']['og_notifications_content_types'] = array(
@@ -514,7 +514,7 @@ function _og_notifications_node_options($account, $node) {
   if (og_is_group_type($node->type) && isset($account->og_groups[$node->nid])) {
     foreach (array_filter(variable_get('og_notifications_content_types', array())) as $type) {
       $options[] = array(
-        'name' => t('%type posts in %group', array('%group' => $node->title, '%type' => node_get_types('name', $type))),
+        'name' => t('%type posts in %group', array('%group' => $node->title, '%type' => og_tt("nodetype:type:$type:name", node_get_types('name', $type)))),
         'type' => 'grouptype',
         'fields' => array('group' => $node->nid, 'type' => $type)
       );
@@ -528,7 +528,7 @@ function _og_notifications_node_options($account, $node) {
       if (isset($account->og_groups[$gid]) && in_array($node->type, array_filter(variable_get('og_notifications_content_types', array())))) {
         // Content type
         $options[] = array(
-          'name' => t('%type posts in %group', array('%group' => $node->og_groups_both[$gid], '%type' => node_get_types('name', $node->type))),
+          'name' => t('%type posts in %group', array('%group' => $node->og_groups_both[$gid], '%type' => og_tt("nodetype:type:$node->type:name", node_get_types('name', $node->type)))),
           'type' => 'grouptype',
           'fields' => array('group' => $gid, 'type' => $node->type)
         );
@@ -577,4 +577,4 @@ function og_notifications_autosubscribe_map() {
     0 => t('Disabled'),
     1 => t('Enabled'),
   );
-}
\ No newline at end of file
+}
diff --git a/modules/og_notifications/og_notifications.pages.inc b/modules/og_notifications/og_notifications.pages.inc
index 18b6832..f70536c 100644
--- a/modules/og_notifications/og_notifications.pages.inc
+++ b/modules/og_notifications/og_notifications.pages.inc
@@ -48,7 +48,7 @@ function og_notifications_add_form($form_state, $account, $groups) {
   $content_types = array_filter(variable_get('og_notifications_content_types', array()));
   $content_names = node_get_types('names');
   foreach ($content_types as $type) {
-    $content_types[$type] = $content_names[$type];
+    $content_types[$type] = og_tt("nodetype:type:$type:name", $content_names[$type]);
   }
   $defaults = _notifications_subscription_defaults($account);
   $send_methods = _notifications_send_methods();
diff --git a/og.module b/og.module
index ef6a439..7aaa3f5 100644
--- a/og.module
+++ b/og.module
@@ -2206,7 +2206,7 @@ function og_form_add_og_audience(&$form, &$form_state) {
       '#multiple' => TRUE);
   }
   else if ($required) {
-    form_set_error('title', t('You must <a href="@join">join a group</a> before posting a %type.', array('@join' => url('og'), '%type' => node_get_types('name', $node->type))));
+    form_set_error('title', t('You must <a href="@join">join a group</a> before posting a %type.', array('@join' => url('og'), '%type' => og_tt("nodetype:type:$node->type:name", node_get_types('name', $node->type)))));
   }
 }
 
@@ -2749,7 +2749,7 @@ function og_og_create_links($group) {
   foreach ($post_types as $post_type) {
     // We used to check for node_access(create) but then node admins would get a false positive and see node types that they could not create.
     // When this becomes a proper menu in D6, we get sorting for free
-    $type_name = $types[$post_type]->name;
+    $type_name = og_tt("nodetype:type:$post_type:name", $types[$post_type]->name);
     $type_url_str = str_replace('_', '-', $post_type);
     if (module_invoke($types[$post_type]->module, 'access', 'create', $post_type, $user)) {
       $links["create_$post_type"] = l(t('Create !type', array('!type' => $type_name)), "node/add/$type_url_str", array(
@@ -2887,3 +2887,15 @@ function og_check_token($token, $seed) {
 function og_broadcast_access($node) {
   return og_is_group_admin($node) && module_exists('og_notifications');
 }
+
+/**
+ * Wrapper function for tt() if i18nstrings enabled.
+ */
+function og_tt($name, $string, $langcode = NULL, $update = FALSE) {
+  if (module_exists('18nstrings')) {
+    return tt($name, $string, $langcode, $update);
+  }
+  else {
+    return $string;
+  }
+}