diff -u gnome-control-center-3.6.0/panels/common/cc-common-language.c\~ gnome-control-center-3.6.0/panels/common/cc-common-language.c
--- gnome-control-center-3.6.0/panels/common/cc-common-language.c~	2012-09-25 00:39:33.000000000 +0900
+++ gnome-control-center-3.6.0/panels/common/cc-common-language.c	2012-09-26 12:24:34.418976111 +0900
@@ -532,6 +532,9 @@
         if (gdm_language_has_translations ("es") ||
             gdm_language_has_translations ("es_ES"))
                 g_hash_table_insert (ht, g_strdup ("es_ES.utf8"), g_strdup (_("Spanish")));
+        if (gdm_language_has_translations ("ja") ||
+            gdm_language_has_translations ("ja_JP"))
+                g_hash_table_insert (ht, g_strdup ("ja_JP.utf8"), g_strdup (_("Japanese")));
         if (gdm_language_has_translations ("zh_CN"))
                 g_hash_table_insert (ht, g_strdup ("zh_CN.utf8"), g_strdup (_("Chinese (simplified)")));
         if (gdm_language_has_translations ("ru") ||
