We want to have an option to add a `disabled` property to links in dropdown menus.
This should work if we add `class: 'disabled'` to the `li` tag element.
However, the way to do it is to change somehow the `action_buttons` method, which is used widely in Foreman (maybe by passing a new argument).
Maybe there is another way this could be done, but I can't think of something better right now.