Merge branch 'master' into feature-update-lo

app/assets/javascripts/management/scores.js

app/assets/stylesheets/management/score.scss

app/controllers/management/scores_controller.rb

app/models/learning_object.rb

app/services/learning_object_publisher.rb

app/services/thumbnail_service.rb

app/views/management/scores/index.html.erb

app/views/shared/management/_nav_menu.html.erb

app/workers/dspace_upload_worker.rb

app/workers/thumbnail_generate_worker.rb

lib/tasks/language.rake

lib/tasks/thumbnail.rake