Merged r13284 from trunk to 2.5-stable (#17399)

German translation updated by Daniel Felix.

git-svn-id: http://svn.redmine.org/redmine/branches/2.5-stable@13288 e93f8b46-1217-0410-a6f0-8f06a7374b81
Merged r13285 from trunk to 2.5-stable (#17421)

Traditional Chinese translation updated by ChunChang Lo.

git-svn-id: http://svn.redmine.org/redmine/branches/2.5-stable@13289 e93f8b46-1217-0410-a6f0-8f06a7374b81
Merged r13299 from trunk to 2.5-stable (#17451)

Bulgarian translation updated by Ivan Cenov.

git-svn-id: http://svn.redmine.org/redmine/branches/2.5-stable@13300 e93f8b46-1217-0410-a6f0-8f06a7374b81
Merge remote-tracking branch 'upstream/2.5-stable' into ro-2-5
bundle update