Merged r11597 from trunk to 2.3-stable (#13437)

German translation of setting_emails_header changed by Filou Centrinov.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/branches/2.3-stable@11598 e93f8b46-1217-0410-a6f0-8f06a7374b81