Fix failing link spec due to hets error

This commit will be reverted as soon as
https://github.com/spechub/Hets/issues/1433
is resolved.
Run rename refactor script.
Revert renaming in app/assets/javascripts/repository/clone-url.js.coffee.
Revert renaming in app/assets/javascripts/repository_directories.js.coffee.
Adjust controller name.
Revert renaming in app/controllers/repository_directories_controller.rb.
Revert renaming in and of link_helper and related.
Revert renaming in app/helpers/ontology_helper.rb.
Revert renaming in repositories_helper and related.
Revert renaming in app/helpers/sentence_helper.rb.
Adjust module name.
Adjust class name.
Remove now self-calling methods.
Rename local variable linktype to mapping_type.
Adjust class name.
Adjust class name.
Revert renaming in app/views/devise/.
Revert renaming in app/views/home/show.html.haml.
Revert renaming in app/views/kaminari.
Revert renaming in app/views/layouts/application.html.haml.