Write the install language to the registry for user-level installs.

chrome/installer/util/l10n_string_util.h

Index: chrome/installer/util/l10n_string_util.h
diff --git a/chrome/installer/util/l10n_string_util.h b/chrome/installer/util/l10n_string_util.h
index e4420d9a5a721f6995af69ed742b51328c750583..27ee23906f84f221d9e71093a611fe169d1cd1a8 100644
--- a/chrome/installer/util/l10n_string_util.h
+++ b/chrome/installer/util/l10n_string_util.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
@@ -27,6 +27,9 @@ std::wstring GetLocalizedString(int base_message_id);
 // The empty string is returned on failure.
 std::wstring GetLocalizedEulaResource();
 
+// Returns the language identifier of the translation currently in use.
+std::wstring GetCurrentTranslation();
+
 }  // namespace installer.
 
 #endif  // CHROME_INSTALLER_UTIL_L10N_STRING_UTIL_H_