diff --git a/core/modules/locale/locale.module b/core/modules/locale/locale.module
index 6f81480..fec0659 100644
--- a/core/modules/locale/locale.module
+++ b/core/modules/locale/locale.module
@@ -1175,6 +1175,18 @@ function _locale_rebuild_js($langcode = NULL) {
 }
 
 /**
+ * Implement hook_update_filter_project_info_whitelist_alter().
+ *
+ * Add interface translation specific info file keys to retention whitelist.
+ */
+function locale_update_filter_project_info_whitelist_alter(&$whitelist) {
+  $whitelist[] = 'interface translation project';
+  $whitelist[] = 'interface translation server';
+  $whitelist[] = 'interface translation url';
+  $whitelist[] = 'interface translation pattern';
+}
+
+/**
  * Save locale specific date formats to the database.
  *
  * @param $langcode
diff --git a/core/modules/update/update.compare.inc b/core/modules/update/update.compare.inc
index b729750..cc37d21 100644
--- a/core/modules/update/update.compare.inc
+++ b/core/modules/update/update.compare.inc
@@ -37,11 +37,11 @@ function update_get_projects() {
       // Still empty, so we have to rebuild the cache.
       $module_data = system_rebuild_module_data();
       $theme_data = system_rebuild_theme_data();
-      _update_process_info_list($projects, $module_data, 'module', TRUE);
-      _update_process_info_list($projects, $theme_data, 'theme', TRUE);
+      _update_process_info_list($projects, $module_data, array('type' => 'module', 'status' => TRUE, 'category' => 'community'));
+      _update_process_info_list($projects, $theme_data, array('type' => 'theme', 'status' => TRUE, 'category' => 'community'));
       if (variable_get('update_check_disabled', FALSE)) {
-        _update_process_info_list($projects, $module_data, 'module', FALSE);
-        _update_process_info_list($projects, $theme_data, 'theme', FALSE);
+        _update_process_info_list($projects, $module_data, array('type' => 'module', 'status' => FALSE, 'category' => 'community'));
+        _update_process_info_list($projects, $theme_data, array('type' => 'theme', 'status' => FALSE, 'category' => 'community'));
       }
       // Allow other modules to alter projects before fetching and comparing.
       drupal_alter('update_projects', $projects);
@@ -70,19 +70,27 @@ function update_get_projects() {
  *   Reference to the array of project data of what's installed on this site.
  * @param $list
  *   Array of data to process to add the relevant info to the $projects array.
- * @param $project_type
- *   The kind of data in the list (can be 'module' or 'theme').
- * @param $status
- *   Boolean that controls what status (enabled or disabled) to process out of
- *   the $list and add to the $projects array.
+ * @param $conditions
+ *   Array of filter conditions:
+ *    'type'     The kind of data in the list (can be 'module' or 'theme').
+ *    'status'   Boolean that controls what status (enabled or disabled) to
+ *               process out of the $list and add to the $projects array.
+ *    'hidden'   (optional) Boolean indicating whether hidden modules should be
+ *               included.
+ *    'category' (optional) The kind of project.
+ *               Can be 'community' or 'interface translation'
  *
  * @see update_get_projects()
  */
-function _update_process_info_list(&$projects, $list, $project_type, $status) {
+function _update_process_info_list(&$projects, $list, $conditions) {
+  // Set default filter conditions if required.
+  $default = array('hidden' => FALSE, 'category' => 'all');
+  $conditions = array_merge($default, $conditions);
+
   foreach ($list as $file) {
     // A disabled base theme of an enabled sub-theme still has all of its code
     // run by the sub-theme, so we include it in our "enabled" projects list.
-    if ($status && !$file->status && !empty($file->sub_themes)) {
+    if ($conditions['status'] && !$file->status && !empty($file->sub_themes)) {
       foreach ($file->sub_themes as $key => $name) {
         // Build a list of enabled sub-themes.
         if ($list[$key]->status) {
@@ -97,7 +105,7 @@ function _update_process_info_list(&$projects, $list, $project_type, $status) {
       }
     }
     // Otherwise, just add projects of the proper status to our list.
-    elseif ($file->status != $status) {
+    elseif ($file->status != $conditions['status']) {
       continue;
     }
 
@@ -107,7 +115,7 @@ function _update_process_info_list(&$projects, $list, $project_type, $status) {
     }
 
     // Skip if it's a hidden module or theme.
-    if (!empty($file->info['hidden'])) {
+    if (!$conditions['hidden'] && !empty($file->info['hidden'])) {
       continue;
     }
 
@@ -121,6 +129,12 @@ function _update_process_info_list(&$projects, $list, $project_type, $status) {
       continue;
     }
 
+    // Skip this project if it doesn't have the right category.
+    $category = isset($file->info['interface translation project']) ? 'interface translation' : 'community';
+    if ($category != $conditions['category'] && $project_category != 'all') {
+      continue;
+    }
+
     // If we don't already know it, grab the change time on the .info file
     // itself. Note: we need to use the ctime, not the mtime (modification
     // time) since many (all?) tar implementations will go out of their way to
@@ -147,9 +161,9 @@ function _update_process_info_list(&$projects, $list, $project_type, $status) {
       $project_display_type = 'core';
     }
     else {
-      $project_display_type = $project_type;
+      $project_display_type = $conditions['type'];
     }
-    if (empty($status) && empty($file->enabled_sub_themes)) {
+    if (empty($conditions['status']) && empty($file->enabled_sub_themes)) {
       // If we're processing disabled modules or themes, append a suffix.
       // However, we don't do this to a a base theme with enabled
       // subthemes, since we treat that case as if it is enabled.
@@ -168,6 +182,7 @@ function _update_process_info_list(&$projects, $list, $project_type, $status) {
       // Add list of base themes.
       $base_themes = !empty($file->base_themes) ? $file->base_themes : array();
     }
+
     if (!isset($projects[$project_name])) {
       // Only process this if we haven't done this project, since a single
       // project can have multiple modules or themes.
@@ -179,7 +194,7 @@ function _update_process_info_list(&$projects, $list, $project_type, $status) {
         'datestamp' => $file->info['datestamp'],
         'includes' => array($file->name => $file->info['name']),
         'project_type' => $project_display_type,
-        'project_status' => $status,
+        'project_status' => $conditions['status'],
         'sub_themes' => $sub_themes,
         'base_themes' => $base_themes,
       );
@@ -200,7 +215,7 @@ function _update_process_info_list(&$projects, $list, $project_type, $status) {
         $projects[$project_name]['base_themes'] += $base_themes;
       }
     }
-    elseif (empty($status)) {
+    elseif (empty($conditions['status'])) {
       // If we have a project_name that matches, but the project_display_type
       // does not, it means we're processing a disabled module or theme that
       // belongs to a project that has some enabled code. In this case, we add
@@ -221,6 +236,9 @@ function update_get_project_name($file) {
   if (isset($file->info['project'])) {
     $project_name = $file->info['project'];
   }
+  elseif (isset($file->info['interface translation project'])) {
+    $project_name = $file->info['interface translation project'];
+  }
   elseif (isset($file->info['package']) && (strpos($file->info['package'], 'Core') === 0)) {
     $project_name = 'drupal';
   }
@@ -775,15 +793,20 @@ function update_project_cache($cid) {
  * @see _update_process_info_list()
  */
 function update_filter_project_info($info) {
-  $whitelist = array(
-    '_info_file_ctime',
-    'datestamp',
-    'major',
-    'name',
-    'package',
-    'project',
-    'project status url',
-    'version',
-  );
+  $whitelist = &drupal_static(__FUNCTION__);
+  if (!isset($whitelist)) {
+    $whitelist = array(
+      '_info_file_ctime',
+      'datestamp',
+      'major',
+      'name',
+      'package',
+      'project',
+      'project status url',
+      'version',
+    );
+    // Let other modules alter the whitelist to keep more information.
+    drupal_alter('update_filter_project_info_whitelist', $whitelist);
+  }
   return array_intersect_key($info, drupal_map_assoc($whitelist));
 }