move de.yml "label_link" by alphabetical order

git-svn-id: http://svn.redmine.org/redmine/trunk@12993 e93f8b46-1217-0410-a6f0-8f06a7374b81
German Translation updated by Daniel Felix (#16399)

git-svn-id: http://svn.redmine.org/redmine/trunk@12994 e93f8b46-1217-0410-a6f0-8f06a7374b81