@@ -, +, @@ 
------------------------------------------------------------------------
--- trac/util/translation.py	(revision 11689)
+++ trac/util/translation.py	(revision 11690)
@@ -339,11 +339,14 @@ 
                               directory is enough.
         """
         try:
-            return [dirname for dirname
-                    in pkg_resources.resource_listdir('trac', 'locale')
-                    if '.' not in dirname
-                    and (not check_catalog or pkg_resources.resource_exists(
+            locales = [dirname for dirname
+                       in pkg_resources.resource_listdir('trac', 'locale')
+                       if '.' not in dirname
+                       and (not check_catalog or pkg_resources.resource_exists(
                         'trac', 'locale/%s/LC_MESSAGES/messages.mo' % dirname))]
+            if 'en_US' not in locales:
+                locales.append('en_US')
+            return locales
         except Exception:
             return []
 
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