diff --git a/install/lang/pt_br/admin.php b/install/lang/pt_br/admin.php
index 950fd596ac8..a35d587b63b 100644
--- a/install/lang/pt_br/admin.php
+++ b/install/lang/pt_br/admin.php
@@ -42,3 +42,4 @@ Por favor use a opção --help.';
 $string['cliyesnoprompt'] = 'digite s (sim) ou n (não)';
 $string['environmentrequireinstall'] = 'deve ser instalado e habilitado';
 $string['environmentrequireversion'] = 'a versão {$a->needed} é necessária e você está usando a versão {$a->current}';
+$string['upgradekeyset'] = 'Chave de atualização (deixe em branco para não defini-la)';
diff --git a/install/lang/zh_tw/admin.php b/install/lang/zh_tw/admin.php
index ef3c78803a4..69f7708e015 100644
--- a/install/lang/zh_tw/admin.php
+++ b/install/lang/zh_tw/admin.php
@@ -40,3 +40,4 @@ $string['cliunknowoption'] = '錯誤選項：{$a}請使用 --help 選項。';
 $string['cliyesnoprompt'] = '輸入y（表示是）或n（表示否）';
 $string['environmentrequireinstall'] = '必須安裝並啟用';
 $string['environmentrequireversion'] = '需求版本為{$a->needed}，而您目前版本為 {$a->current}';
+$string['upgradekeyset'] = '升級密鑰(若不要設定請保持空白)';
diff --git a/install/lang/zh_tw/error.php b/install/lang/zh_tw/error.php
index ae3cd1d4e1c..c7f4ecc5c94 100644
--- a/install/lang/zh_tw/error.php
+++ b/install/lang/zh_tw/error.php
@@ -33,10 +33,10 @@ defined('MOODLE_INTERNAL') || die();
 $string['cannotcreatedboninstall'] = '<p>無法建立資料庫</p>
 <p>指定之資料庫並不存在。使用者並未有權限建立資料庫</p>
 <p>網站管理員需查明資料庫之組態.</p>';
-$string['cannotcreatelangdir'] = '無法建立語言資料夾。';
-$string['cannotcreatetempdir'] = '無法建立暫存資料夾。';
-$string['cannotdownloadcomponents'] = '無法下載元件。';
-$string['cannotdownloadzipfile'] = '無法下載 ZIP 檔案。';
+$string['cannotcreatelangdir'] = '無法建立語言資料夾';
+$string['cannotcreatetempdir'] = '無法建立暫存資料夾';
+$string['cannotdownloadcomponents'] = '無法下載元件';
+$string['cannotdownloadzipfile'] = '無法下載 ZIP 壓縮檔案';
 $string['cannotfindcomponent'] = '找不到元件';
 $string['cannotsavemd5file'] = '無法儲存 md5 檔案';
 $string['cannotsavezipfile'] = '無法儲存 ZIP 檔案';