Merged r12965 from trunk to 2.5-stable (#16356)

Spanish translation updated by Jesus Gutierrez de la Vega.

git-svn-id: http://svn.redmine.org/redmine/branches/2.5-stable@12966 e93f8b46-1217-0410-a6f0-8f06a7374b81
Merged r12967 (#16321).

git-svn-id: http://svn.redmine.org/redmine/branches/2.5-stable@12978 e93f8b46-1217-0410-a6f0-8f06a7374b81
Merged r12971 (#16255).

git-svn-id: http://svn.redmine.org/redmine/branches/2.5-stable@12979 e93f8b46-1217-0410-a6f0-8f06a7374b81
Merged r12981 from trunk to 2.5-stable (#16368)

Polish translation updated by Jan Inowolski.

git-svn-id: http://svn.redmine.org/redmine/branches/2.5-stable@12982 e93f8b46-1217-0410-a6f0-8f06a7374b81
update latest dependency