LPS-49937 rename select_article -> select_parent
LPS-49937 rename move_article -> move_entry
LPS-49937 rename references to "KBArticle"

Now that parent selection does not depend on KBArticles, rename
variables and Js code to use the more general term "KBEntry".
LPS-49937 check permission for KBArticle also
LPS-49937 Rename to object instead of entry in order to be able to follow the same pattern in other portlets like BookmarksEntry and also Sync is already using this