Unfortunately there is not a tool that allows admins to edit multiple threads at once. There are preventative tools that can ensure invalid links or external links go into moderation prior to publishing https://community.jivesoftware.com/docs/DOC-150765#jive_content_id_Configuring_Link_moderation. However we do not have a feature to allow you to remove link from multiple pages at once.
Although it would not help you in the short-term, you might consider creating a feature request for the tool here Ideas for Jive. This would allow others to vote it up and help it gain visibility with our Products team.