Merged r13684 from trunk to 2.6-stable (#18534, #18502)

Galician (gl) translation updated by Adrián Chaves Fernández.

git-svn-id: http://svn.redmine.org/redmine/branches/2.6-stable@13685 e93f8b46-1217-0410-a6f0-8f06a7374b81