Allows to register individually users from group into workspace
Adds missing spanish translations
translations update
Merge remote-tracking branch 'upstream/master'
Merge pull request #931 from kitan1982/workspace-registration-via-group

Register individually users from group to workspace
Unpublish resource node in grayscale
Merge pull request #932 from solispauwels/master

Unpublish resource node in grayscale
Merge branch 'master' of https://github.com/claroline/CoreBundle into separate-personal-workspace
Separates personal workspaces from others in admin workspace registration