Merged r11901 from trunk to 2.3-stable (#14145)

German translation of x_hours updated by Filou Centrinov.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/branches/2.3-stable@11903 e93f8b46-1217-0410-a6f0-8f06a7374b81