Added autologin feature (disabled by default).

To enable this feature, go to administration settings and choose a duration for autologin.
When enabled, a checkbox on the login form lets users activate autologin.

git-svn-id: http://redmine.rubyforge.org/svn/trunk@514 e93f8b46-1217-0410-a6f0-8f06a7374b81

lang/ja.yml

@@ -172,6 +172,7 @@ setting_autofetch_changesets: SVNコミットを自動取得する
 setting_sys_api_enabled: リポジトリ管理用のWeb Serviceを有効化する
 setting_commit_ref_keywords: Referencing keywords
 setting_commit_fix_keywords: Fixing keywords
+setting_autologin: Autologin
 
 label_user: ユーザ
 label_user_plural: ユーザ
@@ -381,6 +382,8 @@ label_end_to_start: start to end
 label_end_to_end: end to end
 label_start_to_start: start to start
 label_start_to_end: start to end
+label_stay_logged_in: Stay logged in
+label_disabled: disabled
 
 button_login: ログイン
 button_submit: 変更